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Electrostatic Voltmeter (high voltage) Model ESH AC / DC electrostatic voltmeter is available as a single range instrument up to 100 kv fs (150 kv DC only), or with as many as 4 switch-controlled ranges from 3 to 50 kv fs. Their extremely high impedance ( typically l x 10 15th ) prevents loading down circuits.Capacitance varies from approx. 30mmfd on the 5 kv range to 10mmfd on the 50 kv range. Accuracy is normally +/- l % fs but is available to +/- 0.5% fs on selected models up to 50 kv. 6" scale length. Transit lock, carrying handles and brackets for panel mounting available.