Amprobe RS-3 PRO analog clamp meter 300 A 600 V CAT IV 600 V 46 mm jaw

Amprobe RS-3 PRO analog clamp meter 300 A 600 V

The Amprobe RS-3 PRO is an analog clamp meter built for electrical testing up to 300 A AC and 600 V AC. Its 46 mm jaw opens to 1.8 in, allowing measurement on large conductors without breaking the circuit. The rotary-scale display provides direct readings for current, voltage and resistance up to 1 000 ohms. It carries a CAT IV 600 V safety rating for service-entrance work.

Who this suits and who should look elsewhere

Electricians and technicians needing a rugged analog instrument for high-energy three-phase panels will find the CAT IV rating and wide jaw appropriate. Buyers who require true-RMS accuracy on distorted waveforms, data logging, DC current ranges or a digital readout should choose a different meter. The average-responding AC circuit and lack of DC functions limit use on variable-speed drives or solar arrays.

Deciding specification — CAT IV 600 V safety rating

The CAT IV 600 V rating is the single figure that determines whether this clamp meter can be used at the service entrance or on utility feeders. Lower-rated CAT III meters must not be connected to those points. If your work stays downstream of the main distribution board, a CAT III instrument would also function, but only the CAT IV marking guarantees compliance for upstream measurements.