Check the listing for details. MONROE ELECTRONICS ISOPROBE ELECTROSTATIC VOLTMETER MODEL 244. Condition: Used. Listed at 68.00 USD. ±3kV Range Measurement Without Physical Contact Fast Speed-of-Response Specified AC Performance Digital Liquid Crystal Display HV/1000 Recorder Output The Monroe Electronics 244 / 244A ISOPROBE Electrostatic Voltmeter measures surface potential in the range of ±3000 volts without contacting the measured surface. It features high-accuracy (0.1%), drift-free measurements that are almost fully independent of probe-to-surface separation. It enjoys a proven record and long, successful history in both laboratory and manufacturing environments. Side- and end-viewing probes accommodate various mounting requirements. Specialty high-resolution probes allow the 244A to resolve spot diameters as small as 1 mm. Probes include air purge capability to prevent ingress of particulate. Free shipping to lower 48 states only