CA770 - Rangefinder Cotech - Free user manual and instructions
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| Product Type | Laser Rangefinder |
| Model | CA770 |
| Brand | Cotech |
| Measuring Range | 0.05 – 70 m |
| Accuracy | ± 2 mm |
| Measurement Units | m, ft, in |
| Laser Class | Class 2, < 1 mW, 635 nm |
| Functions | Distance, Area, Volume, Continuous Measurement, Addition/Subtraction, Memory |
| Display | Backlit LCD |
| Auto Shut-off | After 3 minutes of inactivity (laser), after 30 seconds (device) |
| Power Supply | 2 × AAA batteries (1.5 V) |
| Battery Life | Up to 5,000 measurements |
| Dimensions (H × W × D) | 115 × 50 × 28 mm |
| Weight | 130 g (including batteries) |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Water/Dust Protection | IP54 (splash proof) |
| Included Accessories | Carrying case, wrist strap, 2 × AAA batteries, user manual |
| Cleaning | Wipe with a soft, dry cloth; do not use solvents |
| Safety | Do not point laser at eyes; avoid reflective surfaces |
| Repairability | No user-serviceable parts; contact service center for repairs |
| Warranty | 2 years |
Frequently Asked Questions - CA770 Cotech
How to switch between units (m/ft/in)?
Press and hold the UNIT button for 2 seconds to cycle through meters, feet, and inches.
What is the maximum measuring distance?
The Cotech CA770 can measure up to 70 meters under favorable conditions (good target reflectivity, daylight).
How to perform continuous measurement?
Press and hold the MEASURE button for 2 seconds to enter continuous mode. The distance updates in real time. Press again to stop.
Why does the device show an error or no reading?
Common causes: target too far, poor reflectivity (e.g., dark surface), laser misaligned, or low battery. Ensure the target is within range and clean the lens.
How to replace the batteries?
Slide off the battery cover on the back and insert 2 AAA batteries with correct polarity. Close the cover securely.
Is the laser safe for eyes?
The device uses a Class 2 laser (< 1 mW). Avoid direct eye exposure. Do not stare into the beam.
Can I measure distances through glass or water?
No, the laser cannot penetrate glass or water. Measurements through glass may be inaccurate. Always measure to a solid, opaque target.
How to clean the lens?
Use a soft, lint-free cloth slightly dampened with water. Do not use alcohol or abrasive cleaners. Dry thoroughly before use.
What does the 'Err' message mean?
'Err' indicates an invalid measurement. The target may be too close (< 0.05 m), too far, or the laser signal is weak. Check the target surface and try again.
How to store the device when not in use?
Remove the batteries to prevent leakage. Store in the included carrying case in a dry, cool place (0–40°C). Avoid direct sunlight and humidity.
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