Vktech&reg; CM8801FN 0-1250um/0-50mil Coating Thickness Gauge Paint Tester Meter FN Type Range: 0 - 1250um; M, 0 - 50mil Principle: F type-magnetic induction, NF type-eddy current Resolution: 1um0.1mils Accuracy: +/- (3%+2um) or +/- (3%+0.1mils) Battery: 1 x 1.5V AAA size (Not included)