Kyoritsu 2117R Digital Clamp Meter - True RMS 1000A AC Auto-Ranging Earth Clamp Tester then the RCD may be

then the RCD may be faulty

KYORITSU 5410 RCD Tester

* Body: Zinc alloy

the KEW 4105DL provides accurate measurements critical for electrical safety and system reliability

Kyoritsu 2117R Digital Clamp Meter - True RMS 1000A AC Auto-Ranging Earth Clamp Tester then the RCD may beKYORITSU 2117R Digital AC Clamp Meter with True RMS : The 1000A Gold Standard Precision Amperage for the Modern Pro The Kyoritsu 2117R is the go to "workhorse" for electricians, HVAC engineers, and industrial maintenance teams. Built to handle high demand environments, it allows you to measure up to 1000A AC safely without interrupting the circuit. Whether you are troubleshooting industrial motors or complex commercial panels, this True RMS meter