1Multiple Functions: Thickness gauge can be cleared at any position to facilitate micro difference measurement. With the switch key, you can choose to automatically cut off the power. 2Product Parameters: Resolution: 0.01MM/0.001in, measuring range: 024MM/1in, working temperature: 040, storage and transportation temperature: 2070. 3Measurement System Conversion Key: When different formats are required to display, you can press mm/in to select. 4Battery Cover Installation Method: Remove the battery cover, replace with a new battery (positive side facing up, battery not inculded), and then install the battery cover. 5Use Method: Press the measuring button to make the upper measuring head have enough distance from the lower measuring head. Place the workpiece to be side on the lower measuring head and loosen the measuring button to press the upper measuring head tightly on the workpiece, and then take a reading. 6Safety Tips: When using, it should be prevented from hitting and falling to avoid loss of accuracy. Keep it clean and avoid the penetration of water and other liquid substances, so as not to affect normal use. No voltage can be applied to any part, do not use pen lettering, so as not to damage the electronic circuit.