Klein Tools CL810 600A AC/DC Auto-Ranging Digital Clamp Meter

Key Features

• Non-Contact Voltage Tester (NCV)
• Low Impedance (LoZ)
• Data & Range Hold
• Audible Continuity
• Diode Test
• Capacitance & Frequency Measurement
• Transflective Reverse-Contrast Display
• Lighted Dial

Ratings: 1000V~, 600A~, 60MΩ

Environmental Protection: 2m Drop Protection, IP40

Other Languages: Español (pg. 17), Français (pg. 33)

Certifications: CE, UKCA, cULus Listed (Intertek 5000573), CAT IV 600V, CAT III 1000V

Image Description: The Klein Tools CL810 digital clamp meter is depicted. It features a clamp jaw at the top, a prominent selector dial, a digital display, and various control buttons. Safety ratings like CAT IV 600V and CAT III 1000V are clearly visible on the device.

General Specifications

The Klein Tools CL810 is an automatically ranging True Root Mean Square (TRMS) digital clamp meter. It measures AC/DC current via the clamp, AC/DC voltage, resistance, continuity, frequency, inrush, capacitance, and tests diodes using test leads. It also measures temperature via a thermocouple probe. The meter includes a Low Impedance (LoZ) mode for identifying ghost or stray voltages, a transflective reverse-contrast display, and a lighted dial.

Environmental Conditions

• Environment: Indoor use only; do not expose to moisture, rain, or snow.
• Operating Altitude: Up to 6562 ft. (2000m)
• Relative Humidity: Less than 80% non-condensing
• Operating Temperature: 32° to 122°F (0° to 50°C)
• Storage Temperature: 14° to 140°F (-10° to 60°C)

Accuracy and Calibration

• Accuracy values are stated at 65° to 83°F (18° to 28°C).
• Temperature Coefficient: 0.1 × (Quoted Accuracy) per °C above 28°C or below 18°C requires correction.
• Auto Power-Off (APO): Meter powers off automatically after 5 minutes of inactivity (can be disabled).
• Dimensions: 9.06" × 3.47" × 1.65" (230 × 88 × 42 mm)
• Weight: 13 oz. (369 g) including batteries
• Calibration: Accurate for one year from date of purchase.

Standards and Safety Ratings

• Standards: IEC EN 61010-1, 61010-2-032. Conforms to UL STD 61010-1, 61010-2-032. Certified to CSA STD C22.2 #61010-1, 61010-2-032.
• Pollution Degree: 2
• Accuracy Definition: ± (% of reading + # of least significant digits)
• Drop Protection: 6.6 ft. (2m)
• Safety Rating: CAT IV 600V, CAT III 1000V, Class 2, Double insulation

Measurement Categories

CAT III

Applicable to test and measuring circuits connected to the distribution part of a building’s low-voltage MAINS installation.

CAT IV

Applicable to test and measuring circuits connected at the source of a building’s low-voltage MAINS installation.

Electromagnetic Environment

IEC EN 61326-1. This equipment meets requirements for use in basic and controlled electromagnetic environments such as residential properties, business premises, and light-industrial locations.

Specifications are subject to change.

Electrical Specifications

Voltage

Input Impedance: 10MΩ | Frequency Range: 50 to 400Hz

Maximum Input: 1000V AC RMS or 1000V DC

Note: All AC voltage ranges are specified from 5% to 100% of range.

Current

Frequency Range: 50 to 60Hz

Microamps

Maximum Input: 1000V AC RMS or 1000V DC

Resistance

Maximum Input: 1000V AC RMS or 1000V DC

Capacitance

Maximum Input: 1000V AC RMS or 1000V DC

Temperature

Other Measurement Applications

• Frequency (Auto-Ranging): 1.000Hz to 500.00kHz. Accuracy: ±(1.0% + 5 digits). Sensitivity: >2V to 220V RMS. Maximum Input: 1000V AC RMS or 1000V DC.
• Duty Cycle: 1.0% to 99.9%. Accuracy: ±(1.2% + 2 digits). Pulse width: >100µs, <100ms. Frequency width: 5Hz to 10kHz. Sensitivity: >2V to 220V RMS. Maximum Input: 1000V DC or 1000V AC RMS.
• Inrush Current: 600.0A. Accuracy: ±(3.0% + 8 digits). Frequency Range: 50 to 60Hz. Detection Range: >2A. Maximum Input: 1000V AC RMS or 1000V DC.
• Diode Test: Max. 1.5mA, open circuit voltage ~3.2V DC.
• Continuity Check: Audible signal <50Ω, test current <1.5mA.
• Sampling Frequency: 4 samples per second.
• Low Impedance (LoZ): Input impedance >3kΩ. Max input 1000V AC RMS or 1000V DC RMS.
• Auto Power-Off: After ~5 minutes of inactivity.
• Overload: "OL" indicated on display, overload protection 1000V in all settings.
• Polarity: "-" on display indicates negative polarity.
• Display: 3-5/6 digit, 6000 Count LCD.

Warnings

General Warnings

To ensure safe operation and service of the meter, follow these instructions. Failure to observe these warnings can result in severe injury or death.

• Before each use, verify meter operation by measuring a known voltage or current.
• Never use the meter on a circuit with voltages exceeding its category-based rating.
• Do not use the meter during electrical storms or in wet weather.
• Do not use the meter or test leads if they appear to be damaged.
• Use only with CAT III 1000V/CAT IV 600V rated test leads or better.
• Ensure meter leads are fully seated, and keep fingers away from metal probe contacts during measurements.
• Use caution with voltages above 25V AC RMS or 60V DC, as they pose a shock hazard.
• To avoid false readings that can lead to electrical shock, replace batteries when a low battery indicator appears.
• Do not attempt to measure resistance or continuity on a live circuit.
• Always adhere to local and national safety codes. Use personal protective equipment to prevent shock and arc blast injury where hazardous live conductors are exposed.
• ⚠️ To avoid risk of electric shock, disconnect leads from any voltage source before removing the battery door.
• ⚠️ To avoid risk of electric shock, do not operate the meter while the battery door is removed.

NCV Function Warnings

• When NCV Function is initiated, a blinking or steady red glow and an audible beep indicate voltage presence. The screen displays sensitivity level (1 to 4 bars). If no indication, voltage could still be present.
• Before and after each use, verify NCVT operation by testing a known working circuit within the unit's rating.
• Never assume neutral or ground wires are de-energized. Neutrals in multi-wire branch circuits may be energized when disconnected and must be retested before handling.
• NCV tester WILL NOT detect voltage if: The wire is shielded, the operator is not grounded, or the voltage is DC.
• NCV tester MAY NOT detect voltage if: The user is not holding the tester, the user is insulated from the tester, the wire is partially buried or in a grounded metal conduit, the tester is at a distance from the source, the field is blocked/dampened, or the voltage frequency is not a sine wave between 50-60Hz.
• Operation may be affected by socket design and insulation type; compatibility with tamper-resistant outlets may vary.
• Do not apply to uninsulated hazardous live conductors.
• Detection above 50V is specified under "normal" conditions. Detection may vary at different thresholds or conditions unless: the tester tip is within 0.25" of the source, the user holds the tester body with a bare hand, the user is grounded, air humidity is nominal (50% RH), and the tester is held still.

Symbols and Features

Symbols on Meter

• AC/DC Current: Current measurement
• NCV: Non-Contact Voltage tester
• Class II: Double Insulated
• ⚠️: Warning or Caution
• ⚡: Risk of Electrical Shock
• 4: Suitable for uninsulated hazardous live conductors
• i: Read Instructions
• Ω: Resistance (in Ohms)
• ))): Audible Continuity
• µA: DC Microamps
• : Diode
• LoZ: Low Impedance
• Hz: Frequency
• V: Voltage (Volts)
• F: Capacitance
• %: Duty-cycle
• °F °C: Temperature (Fahrenheit / Celsius)
• A: Amperage (Amps)
• +: Positive
• –: Negative
• COM: Common
• SEL: Select
• ☀️: Backlight Brightness
• ⏚: Ground
• ?: Work Light
• OFF: Power Off
• INRUSH: Inrush Current
• MAX MIN: Maximum/Minimum Value

Symbols on LCD

• AC: AC (Alternating Current)
• DC: DC (Direct Current)
• –: Negative Reading
• H: Data Hold
• AUTO: Auto Ranging
• : Diode
• F: Farrads
• : Auto Power Off
• NCV: Non-Contact Voltage Tester
• )): Audible Continuity
• [Low Battery]: Low Battery
• °C: Degrees (Celsius)
• °F: Degrees (Fahrenheit)
• k: kilo (value x 10³)
• M: Mega (value x 10⁶)
• µ: micro (value x 10⁻⁶)
• m: milli (value x 10⁻³)
• V: Volts
• n: nano (value x 10⁻⁹)
• Ω: Ohms
• A: Amps
• ZERO: DC Current Zero Function
• Hz%: Frequency/Duty Cycle
• REL: Relative Mode
• ⚠️: Hazardous Voltage Indicator
• INRUSH: Inrush
• MIN: Minimum Value Hold
• MAX: Maximum Value Hold
• Lo Z: Low Impedance

Feature Details

Image Description: A diagram of the clamp meter showing front and back features with numbered callouts.

Front Features:

• 1. 6000 Count LCD Display
• 2. Function Selector Switch
• 3. Clamp
• 10. Clamp Trigger (press to open clamp)
• 11. Arrow Markings (indicate direction for current measurement)
• 14. NCV Sensing Antenna
• 16. Worklight

Back Features:

• 4. "COM" Jack (for black test lead)
• 5. "V / Ω / µA" Jack (for red test lead)
• 6. "HOLD" / Worklight Button
• 7. "RANGE" Button
• 8. "MAX/MIN/INRUSH" Button
• 9. "REL/ZERO"/Brightness Button
• 12. "SEL/NCV" Button
• 13. Test Lead Holder for Test Probe
• 15. Polarity Markings (for DC current)
• 18. Magnetic Mount

Note: There are no user-serviceable parts inside the meter.

Function Buttons

ON/OFF

To power ON the meter, rotate the Function Selector Switch (2) from the OFF setting to any measurement setting. To power OFF, rotate it back to the OFF setting. By default, the meter automatically powers OFF after 5 minutes of inactivity. If it powers off during a measurement, rotate the switch to another setting or press any button to resume. To deactivate auto power-off, press and hold the "SEL/NCV" button (12) before powering ON. The Auto Power Off icon will not be visible when deactivated.

SEL/NCV Button (12)

For Secondary Functions

This button activates secondary functions for each application accessible by the function selector switch (2). For current, voltage, and low impedance, it toggles between AC and DC. For other functions, it switches between continuity, resistance, capacitance, and diode test mode, and between Hz and %, and between °F and °C. Default functions are printed in white; secondary functions are in orange.

For NCV Testing

Press and hold the "SEL/NCV" button (12) to enter Non-contact Voltage Testing (NCV) mode. The NCV icon and "EF" will appear on the display. Approach the conductor with the sensing antenna (14). In the presence of AC voltage, the red NCV light (17) will flash, audible signals will sound, and dashes will appear on the display, increasing with proximity. Release the button to exit NCV mode. Note: Only voltages of 65V AC or greater will be detected.

Data Hold & Worklight

Press the "HOLD" / Worklight Button (6) to hold the current measurement on the display. Press again to resume live measuring. Press and hold to turn on the worklight (16).

Relative Mode

Press the "REL/ZERO"/Brightness Button (9) to initiate measurement relative to the current reading. The REL icon will appear. Subsequent measurements are displayed relative to this original measurement. Applies to Voltage, AC Current, Capacitance, DC µA, and Temperature. Press the button again to exit relative mode.

DC Zero Function

When measuring DC current with the clamp, press the "REL/ZERO"/Brightness Button (9) to activate the DC current zero function. This sets the display to zero by subtracting the current value as an offset. The ZERO icon will appear. Press the button again to exit DC zero mode. Press and hold the "REL/ZERO"/Brightness Button (9) in any mode to adjust LCD backlight brightness. Note: If the DC current range changes, the DC current ZERO function must be repeated.

Function Selector Switch Backlight

The function icons around the Function Selector Switch (2) illuminate by default when the meter is powered on and stop after 3 minutes of inactivity. They re-illuminate upon pressing any button or rotating the switch. Note: To disable the dial backlight, press and hold the "REL/ZERO"/Brightness Button (9) when powering ON the meter.

Range

The meter defaults to auto-ranging mode (AUTO). To manually select a range, press the "RANGE" button (7). The AUTO indicator will deactivate. Repeatedly press "RANGE" to cycle through available ranges. To return to auto-ranging mode, press and hold the "RANGE" button (7) for over one second.

MAX/MIN

When the "MAX/MIN/INRUSH" button (8) is pressed, the meter tracks Maximum and Minimum values. Press the button to toggle between MAX and MIN. If a new MAX or MIN occurs, the display updates. Press and hold the button for over one second to return to normal measuring mode.

Inrush

1. Rotate the Function Selector switch (2) to the Current A setting and press the "MAX/MIN/INRUSH" button (8) before an inrush event. "----" will appear while monitoring. 2. Press and hold the "MAX/MIN/INRUSH" button (8) for over one second to return to normal mode.

Note: In AC current mode, inrush is the default when pressing "MAX/MIN/INRUSH". In other modes, MAX/MIN is default. Inrush mode measures every 20ms; display updates 100ms after entry, then every 300ms.

Operating Instructions

Connecting Test Leads

Do not test if leads are improperly seated, as this can cause intermittent readings. Ensure proper connection by firmly pressing leads into the input jacks completely.

Diagram Description: Shows correct test lead insertion (fully seated) and incorrect insertion (partially seated).

Testing in CAT III / CAT IV Measurement Locations

Ensure the test lead shield is pressed firmly in place. Failure to use the CATIII / CATIV shield increases arc-flash risk. (Shield length: 5/32" or 4 mm).

Diagram Description: Illustrates the test lead shield for CAT III/IV measurements, showing its length (5/32" or 4 mm).

Testing in CAT II Measurement Locations

CAT III / CAT IV shields may be removed for CAT II locations, allowing testing on recessed conductors like standard wall outlets. Take care not to lose the shields.

Diagram Description: Illustrates test lead shields removed for CAT II locations, showing the probe tip length (0.7" or 18 mm).

AC/DC Current (Less than 600A)

Measure current by pressing the clamp trigger (10) to open the clamp (3) and placing it around a single current-carrying wire. Ensure the clamp is completely closed with the trigger fully released, and the wire passes perpendicularly through the center of the clamp, aligned with the arrow markings (11).

Diagram Description: Shows how to place the clamp around a single wire. It indicates LIVE CABLE, NEUTRAL WIRE, GROUND WIRE, and HOT WIRE, and shows the wire passing through the center of the clamp jaws, aligned with arrow markings.

Note: Current measurement is for single conductors only, not cables containing both live and neutral wires (requires a line splitter, e.g., Klein Cat. No. 69409).

1. Rotate the Function Selector Switch (2) to the AC/DC current A setting. The meter defaults to AC; press the "SEL/NCV" button (12) to toggle between AC and DC modes. The AC or DC icon on the LCD indicates the selected mode.
2. Place clamp (3) around the wire. When measuring DC current, align the polarity markings (15) on the clamp with the polarity of the wire to avoid negative readings. The measurement will auto-range and display.

Note: Disconnect test leads when measuring with the clamp. If non-zero values appear before measuring DC current, an offset correction is required. With the meter in DC current mode, press and hold the "SEL/NCV" button (12) to activate the DC current ZERO function. Subsequent DC current measurements will automatically subtract this offset. If the DC current range changes, the DC current ZERO function must be repeated.

AC/DC Voltage (Less than 1000V)

1. Insert the RED test lead into the "V / Ω / µA" jack (5) and the BLACK test lead into the COM jack (4). Rotate the Function Selector Switch (2) to the AC/DC voltage V setting. The meter defaults to AC measurement; press the "SEL/NCV" button (12) to toggle between AC and DC modes.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to V.

2. Apply test leads to the circuit to be tested. The meter will auto-range to display the measurement.

Note: If "–" appears on the LCD, test leads are reversed; swap them. If open leads show mV readings, this is normal noise; touching leads together will show zero volts. The Hazardous Voltage Indicator will appear for voltages >25V AC or >60V DC.

AC/DC LoZ Voltage (Less than 1000V)

1. Insert RED test lead into "V / Ω / µA" jack (5) and BLACK test lead into COM jack (4). Rotate Function Selector Switch (2) to the AC/DC LoZ voltage setting. The meter defaults to AC; press "SEL/NCV" (12) to toggle between AC and DC.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to LoZ.

2. Apply test leads to the circuit. The meter will auto-range to display the measurement.

Note: Do not attempt to measure voltages greater than 1000V in LoZ setting.

Continuity

1. Insert RED test lead into "V / Ω / µA" jack (5) and BLACK test lead into COM jack (4). Rotate Function Selector Switch (2) to the Continuity/Resistance/Capacitance/Diode Test setting. Ensure the Continuity Testing icon ())) is visible; press "SEL/NCV" (12) repeatedly if needed.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to the continuity symbol.

2. Remove power from the circuit.

3. Connect test leads to the conductor or circuit. If resistance is less than 50Ω, an audible signal will sound, and the display will show a resistance value. If the circuit is open, the display will show "OL".

⚠️ DO NOT attempt to measure continuity on a live circuit.

Resistance Measurements

1. Insert RED test lead into "V / Ω / µA" jack (5) and BLACK test lead into COM jack (4). Rotate Function Selector Switch (2) to the Continuity/Resistance/Capacitance/Diode Test setting. Press "SEL/NCV" (12) once to enter Resistance testing mode; the Resistance icon (Ω) will appear.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to the resistance symbol.

2. Remove power from the circuit.

3. Connect test leads to the circuit to measure resistance. The meter will auto-range.

Note: "OL" indicates open or failed resistor. ⚠️ DO NOT attempt to measure resistance on a live circuit.

Capacitance

1. Insert RED test lead into "V / Ω / µA" jack (5) and BLACK test lead into COM jack (4). Rotate Function Selector Switch (2) to the Continuity/Resistance/Capacitance/Diode Test setting. Press "SEL/NCV" (12) twice to enter Capacitance testing mode; the F unit icon will appear.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to the capacitance symbol.

2. Remove power from the circuit.

3. Connect test leads across the capacitor to measure capacitance. The meter will auto-range.

Diode Test

1. Insert RED test lead into "V / Ω / µA" jack (5) and BLACK test lead into COM jack (4). Rotate Function Selector Switch (2) to the Continuity/Resistance/Capacitance/Diode Test setting. Press "SEL/NCV" (12) three times to enter Diode testing mode; the Diode icon will appear.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to the diode symbol.

2. Touch test leads to the diode. A reading of 200-800mV indicates forward bias. "OL" indicates reverse bias. An open device shows "OL" in both polarities. A shorted device shows approximately 0mV.

Frequency / Duty-Cycle

1. Insert RED test lead into "V / Ω / µA" jack (5) and BLACK test lead into COM jack (4). Rotate Function Selector Switch (2) to the Frequency/Duty-Cycle Hz% setting. Press "SEL/NCV" (12) once to toggle between Frequency (Hz) and Duty-Cycle (%) modes.

Diagram Description: Shows red and black leads connected to the V/Ω/µA and COM jacks respectively, with the selector switch pointing to the Hz% symbol.

2. Measure by connecting test leads across the circuit.

Temperature

1. Insert thermocouple into the "V / Ω / µA" (5) and COM (4) jacks (observe polarity markings). Rotate Function Selector Switch (2) to the Temperature °F/°C setting. Press "SEL/NCV" (12) once to toggle between Fahrenheit (°F) and Celsius (°C) scales.

Diagram Description: Shows a K-Type thermocouple inserted into the V/Ω/µA and COM jacks, with the selector switch pointing to the °F/°C symbol.

2. Make contact between the thermocouple tip and the object being measured. When thermal equilibrium is reached, the measurement will stabilize. The meter will auto-range.

Note: Remove thermocouple before switching to other functions. The included thermocouple is suitable for temperatures below 356°F / 180°C. Use an appropriate thermocouple for higher temperatures.

Maintenance

Battery Replacement

When the [Low Battery] indicator is displayed on the LCD, batteries must be replaced.

1. Remove the screw from the battery door.
2. Replace three AAA batteries, noting proper polarity.
3. Replace the battery door and fasten securely with the screw.

⚠️ To avoid risk of electric shock, disconnect leads from any voltage source before removing the battery door.

⚠️ To avoid risk of electric shock, do not operate the meter while the battery door is removed.

Image Description: Shows three AAA batteries and the open battery compartment of the meter, illustrating battery replacement.

Cleaning

Ensure the meter is turned off. Wipe with a clean, dry, lint-free cloth. Do not use abrasive cleaners or solvents.

Storage

Remove batteries when the meter is not in use for a prolonged period. Do not expose to high temperatures or humidity. After storage in extreme conditions exceeding specified limits, allow the meter to return to normal operating conditions before use.

Compliance and Support

FCC & IC Compliance

See the product page at www.kleintools.com for FCC compliance information. Canada ICES-003 (B) / NMB-003 (B).

Warranty

Visit www.kleintools.com/warranty.

Disposal / Recycle

Do not place equipment and its accessories in the trash. Dispose of items properly according to local regulations. See www.epa.gov/recycle for additional information.

Customer Service

KLEIN TOOLS, INC.
450 Bond Street
Lincolnshire, IL 60069
1-800-553-4676
customerservice@kleintools.com
www.kleintools.com