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Sealey Digital Multimeter - MM20

Sealey Digital Multimeter - MM20

Heavy-duty general-purpose multimeter with a clear and easy-to-read LCD display. This multimeter f...

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eBaySealey Digital Multimeter 8 Function with Thermocouple - MM20
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Product Information

Full details

This guide is for anyone using the Sealey Digital Multimeter MM20. It's designed for general-purpose use, offering accurate measurements of voltage, current, resistance, and temperature. A key benefit is its ease of use due to the clear LCD display and data-hold function. Note that this multimeter is suitable for general tasks, not specialized high-precision applications.

All features

Model Part NumberMM20
BrandSealey

Extended Product Information

FAQs

What is the data hold function?

The data hold function freezes the current reading on the display, allowing you to examine it without needing to keep the probes connected.

How do I measure AC voltage?

Turn the rotary dial to the AC voltage setting (V~) and connect the probes to the circuit.

How do I measure DC current?

Turn the rotary dial to the DC current setting (A=) and connect the probes in series with the circuit.

What is the purpose of the diode test?

The diode test helps to determine if a diode is working correctly by measuring the voltage drop across it.

Can I use this multimeter on high-voltage circuits?

The MM20 is designed for general-purpose use. Always check the multimeter's specifications before use and adhere to safety precautions.

How do I replace the battery?

Remove the battery compartment cover (usually on the back). Replace with the correct type of battery, matching the polarity.

What should I do if the multimeter is damaged?

Discontinue use immediately. Contact Sealey or a qualified technician for repair or replacement.

Troubleshooting

Multimeter does not power on.

Check the battery and replace if necessary. Ensure the battery is installed correctly.

Incorrect readings.

Ensure the leads are properly connected to the correct jacks. Check the function dial setting. Check for damaged leads.

Display is dim or blank.

Replace the battery.

Continuity test does not beep.

Ensure the circuit is complete. Check the leads and connections.

Pros and Cons

Pros

  • Easy-to-read LCD screen
  • Data hold function for convenience
  • Includes temperature probe
  • Durable construction with rubber boot
  • Measures a wide range of electrical parameters

Cons

  • Not suitable for high-precision applications
  • Limited advanced features compared to professional multimeters

Setup, Compatibility & Care

  1. Setup: The MM20 comes ready to use. Simply insert the included test leads into the correct input jacks. Select the desired measurement function using the rotary dial.
  2. Compatibility: It is compatible with a wide range of electrical systems. Ensure that the voltage and current ratings are within the multimeter's specifications to avoid damage.
  3. Care: Always store in a dry, clean place. Clean the multimeter with a soft, dry cloth. Avoid using harsh chemicals. Replace the battery when the display indicates low power. Always disconnect the probes from the circuit before changing the function setting.

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