â·ÃÊͺ¶ÒÁÃÒ¤Ò The Extech 380580 offers five resistance ranges for measuring transformer, motor coil, and PC Board resistance. 380580: Battery Powered Milliohm Meter High accuracy, high resolution portable Milliohm Meter for field use Features: Four terminal Kelvin measurements Over-temperature and over-voltage protection 5 ranges with 100µOhm max resolution Invalid test indicators prevent inaccurate measurements Built-in water resistant case with shoulder strap Specifications: Specifications Range Resolution Current Accuracy (%rdg) Resistance 200.0m 0.01 100MA ±(0.5% + 2digits) 2000m 1m 100MA ±(0.5% + 2digits) 20.00 0.01 10MA ±(0.5% + 2digits) 200.0 0.1 10MA ±(0.5% + 2digits) 2000 1 1MA ±(0.5% + 2digits) Power 8 AA batteries Weight 3.3lbs (1.5kg Dimensions/Weight 9.8 x 7.5 x 4.3" (250 x 190 x 110mm 380580 Battery Extech Milliohm Meter Power Analyzer à¤Ã×èͧÇÔà¤ÃÒÐËì¡ÓÅѧ俿éÒ