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Yellow handheld digital multimeter with large LCD display and rotary selector switch

MASTECH

MASTECH MS5201 Digital Multimeter 1999 Counts Insulation Tester

SKU CH-NTT8-HNZ48

A 1999-count digital multimeter that measures insulation resistance up to 2000 MΩ at 250 V, 500 V and 1000 V test voltages

  • TypeDigital Multimeters
  • Insulation tested at 250V, 500V and 1000V for reliable high-voltage checks
  • Audible and visual alarms warn of dangerous high-voltage output during testing
  • Switch-gear error alert prevents incorrect range selection and protects the meter
  • Automatic discharge releases stored line capacitance after each measurement for safety
  • Large 22mm LCD shows up to 1999 counts for clear, easy reading

What the MS5201 does

The MASTECH MS5201 is a 1999-count digital multimeter with a built-in insulation tester. It measures DC voltage up to 1000 V, AC voltage up to 750 V and insulation resistance from 0 to 2000 MΩ at test voltages of 250 V, 500 V and 1000 V. The instrument suits electricians and maintenance engineers who need combined live-circuit and insulation checks in one handheld tool.

Behaviour under sustained use

The meter uses a dual-slope integration A/D converter sampling about 0.4 seconds per reading, with automatic discharge of measured line capacitance after each insulation test. High-voltage output triggers an acousto-optic warning and a switch-gear error alert protects the operator during repeated measurements. Insulation test current meets the IEC 348 requirement, and the LCD shows 22 mm characters for clear visibility during long sessions.

What to verify before ordering

The unit runs on six 1.5 V AA batteries, so confirm you have a fresh set or a reliable supply. Accuracy is specified at 18 °C to 28 °C with relative humidity below 75 %, so the operating environment must stay within those limits. The maximum voltage between earth and the test leads is 1000 V DC or AC; ensure the circuits you intend to test do not exceed that rating.

Highlights

  • Insulation tested at 250V, 500V and 1000V for reliable high-voltage checks
  • Audible and visual alarms warn of dangerous high-voltage output during testing
  • Switch-gear error alert prevents incorrect range selection and protects the meter
  • Automatic discharge releases stored line capacitance after each measurement for safety
  • Large 22mm LCD shows up to 1999 counts for clear, easy reading

Specifications

TypeDigital Multimeters

Questions about this item

Does the 1999-count LCD and 0.4-second sampling make the MS5201 noisy or hot during all-day insulation testing?

The meter has no fan or moving parts, so it runs silently; the LCD and low-power CMOS circuitry draw only a few milliamps from the six 1.5 V AA cells, producing no noticeable heat even during continuous use.

What must I already own to start testing with the MS5201 right out of the box?

You need six AA alkaline or high-energy 1.5 V batteries — they are not included — and the test leads supplied with the meter.

Will the MS5201 work safely alongside older 250 V or 500 V insulation testers I still use?

Yes; the MS5201 offers selectable 250 V, 500 V and 1000 V test voltages, matching legacy ranges, and its IEC 348-compliant test current ensures consistent readings across instruments.

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