Our Most Sensitive DC Gaussmeter You simply won't find anything this sensitive in this price range! Want to measure the Earth's magnetic field with great precision? Want to detect magnets from a distance? Subtle changes in static magnetic fields? Then this is the unit for you. Only 3" x 4" x 7" and operating on common 9V batteries for total portability and convenience plus AC power adapter included for extended benchtop use. An axial probe (High Sensitivity Hall Generator) with coiled cable is included providing nearly linear response from DC to 60 Hz. Large 3½ digit bipolar display. 4 ranges: 0-2, 20, 200, 2000 mG (yes milliGauss!) and a 5% error guarantee. One year parts and labor warrantee. 200mV DC recorder output included to interface this unit with your PC or recorder.