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Model ESD Electrostatic Voltmeter Model ESD portable AC/DC electrostatic voltmeter is available as a single or multirange instrument to measure from 120 to 6 kv. fs. Insulation resistance is 1 x 10 15th ohms. Capacitance varies from approx. 225 mmfd for a 120 v range to 20 mmfd for a 6 kv range. Multirange instruments are designed for AC/DC measurements on first range. AC only on higher ranges. +/- .5% to 1% fs accuracy (+/- 1.5% for ranges of 150v and less). 5.2" scale length. Size: 7 3/4" x 7 1/2" x 6"