... 5, power switch/adjustment knob 6, battery cover Technical characteristics: 1, pocket with then handheld. 2, nondestructive testing, easy operation ... * 40 * 22 mm weight: about 110 g Operation method: 1, open the power, the power indicator light, instrument began to preheating ... instrumentsNotes:Precision electronic instrument please don't try to open in addition to the battery cover outside of the ...