1. Introduction
Thank you for choosing the Steinel 11221 Digi-Check 3 Digital Voltage Tester. This device is designed for reliable and accurate electrical measurements, including AC/DC voltage, phase, polarity, and continuity. Please read this manual thoroughly before use to ensure safe and optimal operation.
Key Features:
- Digital voltage testing for AC and DC up to 999 volts.
- Microprocessor-controlled for enhanced accuracy.
- Integrated phase and polarity testing functions.
- Continuity testing with a range of 0 to 500 kOhm.
- Clear digital display and LED indicators for easy reading.
2. Safety Instructions
Always observe the following safety precautions to prevent injury or damage to the device:
- Do not use the device if it appears damaged or is not functioning correctly.
- Ensure your hands are dry and you are standing on an insulated surface when performing electrical tests.
- Always verify the tester's functionality on a known live circuit before and after use.
- Do not exceed the maximum rated voltage of 999V AC/DC.
- This device is intended for professional use or by individuals with adequate electrical knowledge.
- Keep the device away from children.
- Refer to local electrical safety regulations and standards.
3. Product Overview
The Steinel 11221 Digi-Check 3 consists of a main unit with a digital display and control buttons, and a separate test probe connected by a flexible cable.

Image 1: Steinel 11221 Digi-Check 3 Digital Voltage Tester. The image shows the main unit with a digital display and two orange buttons (HOLD and TEST), and a separate black test probe connected by a grey cable. Both probes have pointed tips.
Components:
- Main Unit: Houses the digital display, LEDs, and control buttons.
- Test Probe (Red): Integrated into the main unit.
- Test Probe (Black): Separate probe connected via cable.
- Digital Display: Shows voltage readings and other indicators.
- LED Indicators: Provide visual feedback for various tests.
- HOLD Button: Freezes the current reading on the display.
- TEST Button: Initiates specific test functions (e.g., continuity).
4. Setup
The Steinel 11221 Digi-Check 3 is ready for use upon receipt. No initial battery installation is required as it is powered via the circuit being tested or an internal power source (if applicable, check product specifications for details on internal power). Ensure the probes and cable are free from damage before each use.
- Inspect the device for any visible damage to the casing, probes, or cable.
- Clean the probe tips if necessary to ensure good electrical contact.
- Perform a quick functional check on a known voltage source (e.g., a wall outlet) to confirm the device is operating correctly before testing unknown circuits.
5. Operating Instructions
5.1. Voltage Measurement (AC/DC)
- Connect the red probe to the positive or live terminal and the black probe to the negative or neutral/ground terminal of the circuit to be measured.
- The digital display will automatically show the measured voltage value (AC or DC).
- Observe the polarity indicator on the display for DC voltage measurements.
- Press the HOLD button to freeze the current reading on the display. Press again to release.
5.2. Phase Testing
To perform a phase test:
- Touch the red probe to the conductor you wish to test for phase.
- Simultaneously, touch the black probe to a known ground or neutral point.
- The device will indicate the presence of phase voltage through an LED or specific display icon.
5.3. Polarity Testing
For DC circuits, the device automatically indicates polarity:
- When measuring DC voltage, the digital display will show a '+' or '-' symbol next to the voltage reading, indicating the polarity of the red probe relative to the black probe.
5.4. Continuity Testing
To check for continuity in a circuit or component:
- Ensure the circuit is de-energized before performing continuity tests.
- Touch the red and black probes to the two points you wish to test for continuity.
- Press the TEST button (if required, some models automatically detect continuity).
- A low resistance reading (e.g., near 0 Ohm) and/or an audible tone/LED indicator signifies continuity. The device can test continuity up to 500 kOhm.
6. Maintenance
- Cleaning: Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is dry before storage or next use.
- Storage: Store the voltage tester in a dry, cool place, away from direct sunlight and extreme temperatures.
- Probe Inspection: Regularly check the test probes and cable for cuts, cracks, or other damage. Replace if any damage is found.
- Power Source: As the device is powered by the circuit under test or an internal source, no user-replaceable batteries are typically required. Refer to the product's specific technical data for any internal battery information.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No reading on display | No voltage present; poor contact; damaged probes/cable; internal fault. | Verify circuit is live with another known device; ensure firm contact; inspect probes/cable for damage; if problem persists, contact support. |
| Inaccurate readings | Poor contact; interference; device malfunction. | Ensure clean and firm contact; test on a known voltage source; if readings are consistently off, contact support. |
| Continuity test fails | Circuit is open; high resistance; poor contact. | Ensure circuit is de-energized; check for breaks in the circuit; ensure good probe contact. |
8. Specifications
| Feature | Detail |
|---|---|
| Model | 11221 Digi-Check 3 |
| Voltage Range | Up to 999V AC/DC |
| Continuity Test Range | 0 to 500 kOhm |
| Display | Digital and LED |
| Functions | Voltage, Phase, Polarity, Continuity |
| Power Source | Cable electric (powered by circuit under test or internal source) |
| Dimensions (Package) | 24.13 x 7.62 x 3.81 cm |
| Weight (Package) | 362.87 g |
9. Warranty and Support
Steinel products are manufactured to high-quality standards and undergo rigorous quality control. For warranty information, technical support, or service inquiries, please refer to the official Steinel website or contact your local distributor. Keep your purchase receipt as proof of purchase.
For further assistance, please visit the Steinel official website.





