1.The thickness gauge is a precision measuring tool, and it should be prevented from being hit or dropped during use to avoid loss of accuracy. 2.It should be clean to prevent water and other liquid substances from penetrating into the thickness gauge, so as not to affect the normal use. 3.Do voltage to any part of the thickness gauge, and do not use a pen to characters, so as not to damage the electronic circuit. 4.When not in use for a long time, the battery should be taken out. Name: MINI Digital Thickness Gauge Specification:0-20mm/1inch Accuracy:0.01mm/0.0005inch Storage And Transportation Temperature:-20-70 Relative Humidity:less than equal80% Style:Flat Head Style Colour:Gray Material:plastic Package Contents: 1 * Thickness Gauge Only the above package content, other products are not included. 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.