This device is very useful and effective which makes the work of electricians much simpler and easy. The operating temperature of this Multimeter is 0~40 degree Celsius (32~104 degree Fahrenheit) and the storage temperature is 10~50 degree Celsius (14~122 degree Fahrenheit). The relative humidity is <80 % RH, altitude is <200m, the diode is of 2.7 V, and continuity buzzer is <70+-30?. Mastech is a renowned and trusted brand which manufactures all its products using high-grade raw materials, utmost precision, and modern techniques under the supervision of experienced professionals. Featuring data hold, display back light, and low battery display, this digital Multimeter comes with CAT II 600V safety class, Fuse: F1: F250mA or 250V, F2: F 10A or 250V, and waterproof IP20.