Key listed features:

• Angle Range is 0-225°, Measuring precision: +/-0.5°, Increase/Decrease Angle: 0.1°
• If You Want to Use Data Holding Function, You Need to Press the HOLD Button in Red rather than Twist the Knob. (The Knob is Just for Loosening and Tightening.
• The unit Can't Hold the Angle Firm Completely!)
• Come with Backlit LED Display Which Makes it Possible to Read the Data Clearly, Even under a Low Light Circumstance