M500 Megohmmeter for Insulation Testing - Accurate 500V Measurement

In this review of the M500 Megohmmeter for Insulation Testing, the reviewer focuses on who will benefit and the single biggest reason to buy: reliable insulation resistance readings up to 1000 megohms at 500 volts. The tester is aimed at technicians and contractors who need a straightforward handheld instrument for routine insulation checks. It stands out for its clear indicator range and practical storage features, and the review emphasizes real-world use, portability, and value rather than advanced lab features.

Key Features

• Indicator Range: The device measures from 20 to 1000 megohms, giving technicians a wide span for common insulation resistance tasks.
• Applied Voltage: The fixed 500 volt test output makes it suitable for many electrical insulation checks without extra setup.
• Power Source: Runs on C size batteries, so it is easy to keep powered in field work using commonly available cells.
• Lead Storage: A removable back panel stores six long test leads inside the unit, which keeps leads organized and reduces wear during transport.
• Portability: Includes a soft carrying case and an operating manual, making it convenient to carry and reference on job sites.

Who It's For

The M500 is best for electricians, HVAC technicians, and maintenance teams who need a rugged, no-nonsense insulation resistance meter for routine checks. Its 500 volt output and 1000 megohm top range cover most on-site insulation verification tasks for motors, wiring, and components.

Users who need advanced features such as variable test voltages, data logging, or laboratory calibration traceability should look elsewhere; this model focuses on dependable basic performance and portability rather than a broad feature set.

Pros & Cons

Pros

• Clear 20 to 1000 megohm indicator range suits a wide variety of insulation tests.
• Included soft carrying case and manual aid field use and storage of the meter.
• Removable back panel stores six long test leads, keeping the kit tidy and ready to use.

Cons

• Runs on C size batteries that are not included, so you must supply power before first use.

Specifications

Our Verdict

The M500 Megohmmeter is a practical, value-oriented insulation resistance meter for technicians who need reliable 500V checks and a wide measurement range up to 1000 megohms. Its lead storage and included carrying case make it a sensible field tool, while the use of common batteries keeps maintenance simple; choose it when you want a straightforward, portable tester rather than advanced lab features.

Frequently Asked Questions

Does it include test leads?
The unit stores six long test leads inside the removable back panel, but verify which leads are supplied with your package.

Are batteries included?
No, C size batteries are required and are not included with the meter.

What maximum resistance can it measure?
The meter measures insulation resistance up to 1000 megohms at the fixed 500 volt test voltage.