... inductive backlight,auto power off 4.best price 1. IntroductionWe are a developing,design,manufacturing and sales ... , anemometer, sound level meter, noise meter, vibration meter, ultrasonic thickness gauge, film/coating thickness gauge, digital hygrothermograph, high ... S1.4 TYPE2measuring range30~130 dBAaccuracy±1.5 dBdigit & resolution4 digits & 0.1 dBfrequency response31.5Hz ~8.5KHzmeasuring range30 ...