... 5 LED'S 3.Support 9V battery 4.50/60 Hz for Detection Frequency Meter Measure Electromagnetic Radiation ... SPECIFICATION:Detection Range:0 to 20+ milliGaussDetection Frequency:50/60 Hz (50 to 1000Hz -ELF,1000 to 20, ... defects in material and workmanship for a period of 60 days from the date of purchase from the ... purpose,are limited in duration to a period of 60 days from the date of puchase,and no ...