The Fluke 8500A Digital Voltmeter is an excellent systems Multimeter, still widely used because of it’s accuracy, dependability, and ease of use. Basic unit measures DC voltage (100 mV, 1 V, 10 V, 100 V, 1000 V) with 6 ppm accuracy or the ratio of two DC voltages. 6 1/2-digits, the accuracy is ±(0.002% + 4) on lowest range.