High Sensitivity, 3-Axis and Backlight! True-RMS 3 Axis AC Gaussmeter with all the features you could want. A real technological breakthrough. Flat frequency response: ±½dB 30 to 5000 Hz -3dB 15 to 5500 Hz Range 0-250 mG on any axis Maximum resolution 0.01 mG More Features: Selectable axis (3D, X, Y, Z) on ALL features Peak Axis (which axis has the strongest field) On-Screen Graphing (Horizontal bargraph of field strength) Max Hold Variable Brightness Blue LED Backlight Selectable units: milliGauss or microTesla Fast Update Rate: 2.5 times per second Low battery indicator Alkaline battery (included) typically lasts ~15 hours at default backlight setting. Suitable for general purpose magnetic field readings, and great for paranormal work as well. Lowest price for a 3 axis digital gaussmeter!