10mm of usable thread for the locking nut. 26mm length (face to rear of pins).
Sealey Digital AC DC Multimeter/Voltmeter + Leads/Probe & Thermocouple, MM20HV
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VOLTCRAFT VC 63 Two Pole Voltage Tester 12-690 V AC/DC LED/LCD/Buzzer
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UNI-T True RMS Digital Multimeter UT89XD AC DC Voltmeter LED NCV Cap Ohm Tester