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Sealey Digital Multimeter - MM20HV

Sealey Digital Multimeter - MM20HV

The Sealey MM20HV is a heavy-duty general-purpose 8-function digital multimeter designed for relia...

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AmazonSealey Mm20Hv Digital Multimeter 8 Function With Thermocouple Hi-Vis
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Product Information

Full details

The Sealey MM20HV is a robust, heavy-duty 8-function digital multimeter engineered for technicians and serious DIY enthusiasts who require a reliable tool for electrical diagnostics. It excels in delivering accurate readings across AC/DC voltage, current, and resistance while offering the convenience of a protective rubber boot and an integrated stand for hands-free operation; however, it lacks the advanced features found in high-end auto-ranging or true-RMS meters intended for industrial electrical engineering applications.

All features

Model Part NumberMM20HV
BrandSealey

Extended Product Information

FAQs

Does this meter measure AC current?

No, the MM20HV is specified for DC current measurements only.

Can I use this to test transistor gain?

Yes, the device features a dedicated socket/function for transistor (hFE) verification.

Is the temperature probe included in the box?

Yes, a temperature probe is supplied as part of the complete kit.

Is this a True-RMS multimeter?

No, this is a standard digital multimeter designed for general-purpose electronic measurements.

How do I use the data hold function?

Press the dedicated 'HOLD' button while a measurement is on the screen to freeze the value until you press it again.

Troubleshooting

LCD display shows no numbers or looks dim

Check if the internal battery is depleted and replace with a fresh 9V battery if necessary.

Meter displays '1' or 'OL' during a test

This indicates an 'Over Limit' condition; increase the manual range setting on the dial for the current measurement.

Inconsistent or jumpy readings

Verify that test leads are fully inserted into the ports and that probes are making clean, firm contact with the circuit points.

Pros and Cons

Pros

  • Durable construction with protective rubber casing
  • Easy-to-read LCD interface
  • Integrated kickstand for improved ergonomics
  • Comprehensive suite of testing capabilities for general use
  • All-in-one kit including leads and temperature probes

Cons

  • Manual ranging may be slower than auto-ranging alternatives
  • Not intended for high-voltage industrial utility work
  • Lacks True-RMS measurement capability
  • Bulky form factor compared to pocket-sized testers

Setup, Compatibility & Care

To begin using the Sealey MM20HV, insert the provided battery into the rear compartment and connect the test leads into the common (COM) port and the relevant measurement port. Always inspect the test leads for cracks or exposed wire before each use. When measuring DC current, ensure the circuit is de-energized before connecting the meter in series. To prolong the lifespan of the device, avoid exposing the meter to high humidity or excessive moisture, and always turn the function dial to the 'OFF' position when the meter is not in use. Clean the exterior only with a dry, lint-free cloth.

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