1. Introduction
The Accud 296-700-11 Digital Radius Gauge is a precision instrument designed for accurately measuring the radius of internal and external curved surfaces. Featuring a digital display and a wide measuring range, it is an essential tool for various industrial and DIY applications requiring high precision.

Figure 1: The Accud Digital Radius Gauge features a clear digital display for precise radius measurements. It includes buttons for switching between inch and millimeter units, holding the current reading, and zeroing the measurement.
2. Safety Precautions
- Always handle the gauge with care to avoid dropping or impacting it, which can affect its accuracy.
- Keep the gauge clean and free from dust, oil, and other contaminants.
- Do not expose the gauge to extreme temperatures or humidity.
- Avoid disassembling the gauge, as this may void the warranty and cause damage.
- Store the gauge in its protective plastic box when not in use.
3. Setup and Assembly
The Accud Digital Radius Gauge typically comes pre-assembled. However, ensure the measuring probes are securely attached and the battery is correctly installed.
- Battery Installation: Open the battery compartment (usually located on the back or side of the display unit). Insert the appropriate battery, ensuring correct polarity. Close the compartment securely.
- Probe Attachment: Verify that the three contact points (probes) are firmly screwed into the base of the gauge. These probes are crucial for stable and accurate measurements.
- Initial Power On: Press the 'ON/OFF' button to power on the device. The LCD display should illuminate and show a reading.
4. Operating Instructions
Follow these steps for accurate measurement:
- Power On: Press the 'ON/OFF' button to turn on the gauge.
- Unit Selection: Press the 'in/mm' button to switch between millimeter (mm) and inch (in) units as required.
- Zeroing the Gauge: Before taking a measurement, ensure the gauge is zeroed. Place the gauge on a known flat, stable surface or use a master gauge block. Press the 'ZERO' button to set the display to zero. This establishes a reference point for your measurements.
- Taking a Measurement:
- Carefully place the three contact points of the gauge onto the curved surface you wish to measure.
- Ensure all three points are in firm contact with the surface and the gauge is stable.
- The radius value will be displayed on the LCD screen.
- For internal radii, the display will show a positive value. For external radii, it will show a negative value.
- Holding a Reading: Press the 'HOLD' button to freeze the current reading on the display. Press it again to release the hold function.
- Power Off: Press the 'ON/OFF' button again to turn off the gauge when not in use to conserve battery life.
5. Maintenance and Care
- Cleaning: Wipe the gauge with a soft, dry cloth after each use. For stubborn dirt, use a cloth lightly dampened with isopropyl alcohol. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the gauge in its original plastic box in a dry, dust-free environment. Avoid places with high humidity or extreme temperature fluctuations.
- Battery Replacement: Replace the battery promptly when the low battery indicator appears on the display. Dispose of old batteries according to local regulations.
- Calibration: For professional applications, periodic calibration by a certified laboratory is recommended to ensure continued accuracy.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display does not turn on | Dead or incorrectly installed battery | Check battery polarity or replace with a new battery. |
| Inaccurate readings |
|
|
| Display shows 'Err' | Measurement out of range or internal error | Ensure the measured radius is within the specified range. Power off and on the device. If the error persists, contact support. |
7. Specifications
| Feature | Detail |
|---|---|
| Product Name | DIGITAL RADIUS GAGE |
| Model Number | 296-700-11 |
| Brand | INSIZE |
| DIY Supplies | Electrical |
| Electronic | Yes |
| Measuring Range | R5-700mm / 0.2-27.5" |
| Graduation | 0.01mm |
| Accuracy | 0.01R |
| Material | Aluminum Alloy |
| Standard | DIN878 |
| Item Weight | 1000g |
| Package | Plastic Box |
| Origin | Mainland China |
8. User Tips
- For best accuracy, perform measurements in a stable environment free from vibrations and significant temperature changes.
- Always ensure the surface being measured is clean and free of burrs or debris that could interfere with the contact points.
- When measuring large radii, ensure the gauge is held perpendicular to the surface for consistent readings.
- Regularly check the battery level to avoid interruptions during critical measurements.
9. Warranty and Support
This Accud Digital Radius Gauge comes with a 1-Year Warranty from the date of purchase, covering manufacturing defects. Please retain your proof of purchase for warranty claims.
For technical support, warranty claims, or any questions regarding the product, please contact your retailer or the manufacturer directly.
Manufacturer's Overview:
Video 1: An aerial view of a large factory complex at sunset, showcasing the manufacturing environment. This video provides a general overview of the production facilities.