MEASURING PRINCIPLE£º MAGNETIC INDUCTION MEASUREMENT RANGE£º 0¡«200um/500um /1000um/¡/15000um RESOLUTION£º0.1 um(under 100um) 1um (over 100um) ACCURACY: ¡À1¡«3%n or ¡À3um POWER SUPPLY: 4x1.5V AA(UM-3)BATTERY DIMENSION: 161x69x32mm