Using this axis digital angle protractor, you can measure the angle between two faces, not only in earth gravitydirection. Press Angle key at the first face, and then rotate slowly and must keep the rotation axis to another testingface, It will then show the angle once you not move the unit. Any angle measurement is using gyro technique.

Features:
High accuracy ±0.05°, high resolution 0.01°.
Li-lon batt-ery rechargeable, durable.
High resolution, professional measurement.
Single and dual axis, convenient to measure the angle.
Dual and single axis with user friendly LCD display angle.
V shape case for easy to fit at the corner or pipe.
With 5 Side Magnetic base, audible alarming at settable angle range, any angle measurement.
The unit could be charged by connecting the USB cable to the unit and a computer's USB port.

Specifications:
Color: Red
Plug Type: US / EU / UK (Optional)
Accuracy:
0 to 20°: ± (0.05°)
20 to 70°: ± (0.1°)
70 to 90°: ± (0.05°)
Measuring Range Single Axis: 360° , Dual Axis: ±40°
Resolution: 0.01°
Response Time: <0.4 second
Zero Offset Drift Angle Per °C: 0.0058°(typical)
Operating Temperature: 0 to 50°C (32 to 122℉)
Storage Temperature: -10 to 60°C (14 to 140℉)
User Interface: Mono-color LCD with backlight
Supply Power: Rechargeable Li-Polymer 3.7V
Charger Port: 5V 500mA Mini type-B USB port
Power Consumption: tandby: 10uA, Operation: 20mA
Standby batt-ery Life: 4000 hours
Operating batt-ery Life: 40 hours
Magnetic Base: Set on 4 corners
Magnetic Force: N48
Item Size: Approx 7 * 7 * 2.8cm / 2.7 * 2.7 * 1.1in
Item Weight: Approx 119.7g / 4.2oz
Package Size: Approx 17 * 13 * 4.5cm / 6.7 * 5.1 * 1.8in
Package Weight: Approx 250g / 8.8oz

Package List:
1 * Digital Angle Protractor
1 * AC Adapter
1 * User Manual