... 220mm 2.auto null point calibration,sound velocity measuring 3.data storage/inquiry/deletion 1.IntroductionWe are a developing ... meter, noise meter, vibration meter, ultrasonic thickness gauge, film/coating thickness gauge, digital hygrothermograph, high voltage megohmmeter, ground resistance tester, ... *1.5V AAA batteriesnet weight210gdimensions70*145*28mm 3.Packing details4.More models available