... thermometer, anemometer, sound level meter, noise meter, vibration meter, ultrasonic thickness gauge, film/coating thickness gauge, digital hygrothermograph, high voltage megohmmeter, ground resistance tester, electric leakage switch tester ... %H+0.1)mmresolution0.1mmsound velocity range1000~9999m/sworking frequency5MHztubing measuring lower limitΦ20*3mm(steel)auto null point calibration, system ...