Tool Review: Electronic Specialties True RMS Low Current Clamp Meter

The Electronic Specialties True RMS Low Current Clamp Meter, No. 688, features a 3/4" clamp opening, which allows clamping over heavy duty ground cables and some multiple ground cable systems. The larger clamp will permit a wider range of use across heavy duty vehicles. This clamp meter has improved the drift on DC amps readings, and it has a built-in, full-range digital multimeter for true RMS accuracy. The clamp meter measures DC/AC volts, ohms, frequency, capacitance, diodes, continuity and temperature in Fahrenheit and Celsius. Multimeter test leads, a temperature probe and a zippered carrying case are included. 

The review

While working on vans, trucks and even motorhomes, Barry Hoyland, owner of Vehicle Service Solutions of California in Camarillo, Calif., appreciated that the Electronic Specialties True RMS Low Current Clamp Meter could handle multiple tasks.

“One of the major benefits of this tool is the many functions it has the capability of performing,” Hoyland says. “It is able to perform voltage, amperage, ohms, frequency, low current and temperature testing – all with the included adapters and probes.”

 “I like having everything on one tool,” he adds

Hoyland had used the Electronic Specialties Low Current Probe (No. 687) previously, so it was very easy for him to become accustomed to this updated model. Plus the new model has the added convenience of a temperature test function, backlighting and a min/max feature.

“The manual is included, and I did a quick review of it because I am familiar with a previous version,” Hoyland explains. “The manual is very clear on the operation of the tool.”

In order to begin using the True RMS Low Current Clamp Meter, the only step required was installing a 9V battery. But he noted one was not included with the tool.

“It was packaged with everything for measuring,” Hoyland says.

Once operational, Hoyland used the tool while servicing a 2010 Dodge Caravan. He was able to test the temperature of the air conditioning system and test the current of the A/C compressor clutch.

He also ran a parasitic draw test on a 1999 Ford Class A motorhome, and he tested the current of a fuel injector on a 2008 Chevrolet Tahoe.

Even with its many uses, Hoyland felt one way to improve the tool would be giving users the ability to store or print information.

“Maybe use a mini USB port or SD card,” Hoyland suggests.

With no concerns or questions regarding the tool, Hoyland gave the Electronic Specialties True RMS Low Current Clamp Meter a score of 9 out of 10. 

“I rate it high because of the many tests the tool is able to perform,” Hoyland says.