Gauss 3 Axis EMF ELF Magnetic Field 2000mG Meter Range: 20/200/2000 mG , 2/20/200 T Sensor: Triple Axis (X, Y, Z) Accuracy: 20mG (3.0% + 30 digits) at 50Hz/60Hz or 3.0T (3.0% + 30 digits) at 50Hz/60Hz Tri-Axis Gauss Meter is a scientific instrument for measuring electromagnetic fields (EMF) with extremely low frequency (ELF) of 30 ~ 2000 Hz Given an approval from European Directives for health & safety standards (CE Marking)