Introduction
The Mitutoyo 571-203-30 ABSOLUTE AOS digital depth gauge is engineered for precise depth measurements within a 0-300 mm range. Its ABSOLUTE system retains the origin point after power-on, eliminating the need for repeated zero-setting. The electromagnetic inductive AOS encoder ensures reliable measurements even when the scale is exposed to water, oil, or dirt. Featuring a clear digital display and data output capabilities, this instrument supports professional measurement tasks in manufacturing and quality control environments.
Image: The Mitutoyo 571-203-30 ABS AOS VDS-30AX Digital Depth Gauge, showing its main components.
Key Features
- ABSOLUTE System: The origin remains stored after power-on, eliminating the need for a new origin setting.
- AOS Scale: The electromagnetic inductive AOS encoder supports reliable measurements in the presence of water, oil, and dirt on the scale.
- Depth Measurement: Suitable for precise depth measurements in workshops, production, and quality control.
- Data Output: Allows transfer of measured values for professional control processes.
- Measurement Range: Digital depth gauge with a measurement range of 0-300 mm.
Image: An example of Mitutoyo's AOS scale technology, demonstrating its resistance to water and contaminants for reliable measurement.
Setup
- Unpacking: Carefully remove the depth gauge and its accessories from the packaging. Inspect for any damage.
- Battery Installation: The unit requires an SR44 battery. Open the battery compartment cover, insert the battery with the correct polarity, and close the cover securely.
- Cleaning: Before first use, gently wipe the measuring surfaces and scale with a clean, lint-free cloth. Avoid using harsh solvents.
- Power On: Press the ON/OFF button to turn on the device.
- Zero Setting: Place the base of the depth gauge firmly on a flat, reference surface. Extend the measuring rod until it makes contact with the surface. Press the ZERO button to set the display to 0.00 mm.
Operating Instructions
- Prepare the Workpiece: Ensure the surface to be measured is clean and free of burrs or debris.
- Position the Gauge: Place the base of the depth gauge firmly on the reference surface of the workpiece.
- Take Measurement: Slowly extend the measuring rod into the hole, groove, or step until its tip makes firm contact with the bottom surface. Read the measurement directly from the digital display.
- Hold Function (if applicable): Some models may have a HOLD button to freeze the displayed reading.
- Data Output: If connecting to a data processing system, ensure the data output cable is securely connected to the gauge and the receiving device. Refer to the data output system's manual for specific instructions.
- Power Off: Press the ON/OFF button to turn off the device when not in use to conserve battery life.
Maintenance
- Cleaning: After each use, wipe the entire gauge, especially the measuring surfaces and scale, with a clean, dry, lint-free cloth. For stubborn dirt, a cloth lightly dampened with alcohol may be used, but avoid excessive moisture.
- Storage: Store the depth gauge in its protective case in a dry, temperature-controlled environment, away from direct sunlight, dust, and corrosive substances.
- Battery Replacement: When the battery indicator appears on the display, replace the SR44 battery promptly. Ensure correct polarity.
- Calibration: Regular calibration by qualified personnel is recommended to maintain measurement accuracy, especially for critical applications.
- Avoid Impact: Do not drop or subject the gauge to strong impacts, as this can damage the precision components.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display does not turn on | Dead battery; Incorrect battery installation | Replace battery; Reinstall battery with correct polarity |
| Inaccurate readings | Dirty measuring surfaces/scale; Improper zero setting; Mechanical damage | Clean surfaces/scale; Re-zero the gauge; Contact service for repair |
| Display shows error message | Internal error; Excessive movement during measurement | Turn off and on again; Ensure stable measurement; If persistent, contact service |
Specifications
| Model Number | VDS-30AX |
| Part Number | 571-203-30 |
| Measurement Range | 0-300 mm |
| Measurement Accuracy | ±0.03 mm |
| Display Style | LCD |
| Material | Stainless Steel, Plastic |
| Power Source | Battery (SR44) |
| Item Weight | 310 g |
| Product Dimensions | 40.3 x 10 x 1.7 cm |
What's in the Box
- Mitutoyo 571-203-30 ABS AOS VDS-30AX Digital Depth Gauge
- Protective Case
- SR44 Battery (for initial use or as spare)
Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official Mitutoyo website or contact your local Mitutoyo distributor. Keep your purchase receipt as proof of purchase.
You can also visit the official Mitutoyo store on Amazon for more information: Mitutoyo Store





