PLEASE READ THE USER MANUAL BEFORE USING THE COATING GAUGE FOR BEST RESULTS. The Coating Thickness Gauge is a handheld thickness gauge for fast and accurate measurement of the thickness of coatings on metal substrates. This manual describes the operation of the CTG , which guides the user through tasks such as thickness gauge configuration and calibration adjustment. CTG 801 F/NF Automotive Paint thickness gauge allows the user to quickly identify vehicle's damage not reported in public or commercial condition reports including: hidden rework, vehicle impact damage, vehicle re-spray, and filled body panels. Adopts the principle of electromagnetic induction and eddy current effect. Magnetic induction (F-probe); Measuring range: 0 to 1300um Accuracy: ± (3% of readings+2um) Resolution: 0um~999um (1um), 1000um~1300um Switching the thickness gauge on/off To switch on, press on/off key for more than 0.5 seconds. To switch off, press and hold on/off key until the screen blanks. The thickness gauge will switch off automatically after 5 minutes of inactivity. CTG 801 FNF is handheld Coating Thickness Gauge for fast and accurate measurement of Thickness of Coating on Metal Substrata . Backlight display, makes date seen clear even in the dark place. This allows vehicle demage not reported in Public : Like hidden rework , vehicle impact damage , vehicle respray and filled body panels . Switching on / Off To Switch on , Press on/off , Button for more than 0.5 seconds , Until The screen turns blank . The Thickness Gauge will switch off automatically after 5 minutes of inactivity . Tips : Remove the Batteries from the thickness Gauge and store them separately if the thickness Gauge is not to be used for long period of time This will prevent damage to the thickness Gauge in case of battery leakage Always keeps the thickness Gauge in the Box and avoid direct Sun Rays .