The Martindale CM57 True RMS AC Clamp Meter is designed for electricians, HVAC engineers and electrical maintenance technicians who need a versatile clamp meter for accurate fault finding and servicing. With True RMS measurements, frequency, capacitance and non-contact voltage detection, it is ideal for testing electrical installations, HVAC systems and commercial equipment.
Accurate Measurements for Everyday Troubleshooting
The CM57 measures AC current up to 600 A, AC/DC voltage up to 600 V, resistance, continuity, capacitance and frequency, making it suitable for diagnosing motors, control circuits and electrical systems. True RMS technology ensures reliable readings on distorted and non-linear loads, while the integrated NCV function provides a quick way to identify live conductors.
Designed for Professional Use
Featuring a compact ergonomic design with a 25 mm jaw opening, auto ranging, display backlight, hold function and CAT III 600 V / CAT IV 300 V safety rating, the CM57 is built for dependable everyday use. How does the CM57 improve productivity? By combining multiple essential electrical measurements into one compact clamp meter, helping reduce the number of tools you need on site.
Order today to enjoy free delivery, expert support and our 90-day satisfaction guarantee. Need advice? Our team is here to assist you.
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on orders over £99
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
