... 1.2~220mm 2.auto null point calibration,sound velocity measuring 3.data storage/inquiry/deletion 1. ... Our products include laser distance meter,infrared thermometer, anemometer, sound level meter, noise meter, vibration meter, ultrasonic thickness ... data inquiry/ data deletionsound velocity measuringdirectly measure the sound velocity according to sample thicknesslow power indicationauto power offLCD ...