Rechargeable Dual Axis Digital Protractor Bluetooth Inclinometer Magnetic Level Tool for Angle Measurement Range: Uniaxial 4*90 degree/Biaxial 40 degree<br> Resolving power: 0.1 degree<br> Accuracy: Uniaxial 0.2 degree/Biaxial 0.3 degree<br> Repeatablitiy: 0.1 degree<br> Power supply: 3.7V lithium battery<br> Magnet: Only the top and button surface has the magnet<br> Wireless Data transmission function:<br> Pairing: When the tilt box and the receiving device with Bluetooth device (computer, cell phone, etc.) are used together for the first time, the two need to pairing operation, the specific operation is: open the Bluetooth search function of the receiving device (computer, cell phone, etc.), while long press the wireless transmission key on the tilt box, until the"on the LCD of the tilt box begins to flash Indicates that the caliper enters the searched mode, release the wireless transmission key, wait until the receiving device searches for the device with the name K-XXXXXXxXxx, then click connect. After successful connection, "on the LCD of the tilt box will remain on.<br> Data tasmissin ( example, mobile phones and computers): After the connection is successtul, open the ofie software and keep the interface active. Press the wireless tansnission key briefly, and the tit box can send data 10 the rceving devices<br> Main display:<br> 1. For uniaxial measurement, the main display screen only displays x- -axis data<br> 2. For biaxial measurement, the main display screen displays X-axis and Y-axis data at the same time.<br> Colour:black<br> Material:plastic<br> Package Contents:<br> 1 x Level Inclinometer Dual<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.