QAWACHH Multifunctional Electromagnetic Radiation Detector with Sound Alarm Function Ammeter

Requires 3*AAA BATTERIES. Product has to be calibrated after putting batteries. To do this keep it switched on for 10 minutes. It will make a beep sound when calibration is complete. Once this process is done you are ready to measure. The instruction manual provided with the product is useless. However, customer support was good. I called the number provided and they guided me on how to use the product. Five stars for customer service .Product build quality is reasonably good for the price po...