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aFe Power T21D digital multimeter in orange case with LCD display and test leads

aFe Power T21D Auto-Ranging Digital Multimeter 6000 Counts TRMS

SKU CH-0F57-ET40M

Auto-ranging digital multimeter measures AC/DC voltage, current, resistance, capacitance, frequency, duty cycle, diode, continuity and temperature with 6000-count true RMS accuracy

  • Team affiliation1 Piece
  • Key featuresMultimeter, test leads, Thermocouple, Safety tubes, batterie
  • Overall height6.8 L x 14 W x 4.3 H centimeters
  • Overall width6.8 L x 14 W x 4.3 H centimeters
  • Overall length6.8 L x 14 W x 4.3 H centimeters
  • Product weight300 g
  • Auto-ranging removes manual range selection for faster testing
  • 6000-count true RMS delivers accurate AC/DC readings
  • Non-contact voltage detection with audible and visual alerts
  • Measures temperature, capacitance, frequency and duty cycle
  • Compact 300 g design with auto power-off after 15 minutes

Versatile Electrical Tester

The aFe Power T21D is a compact digital multimeter that combines auto-ranging voltage, current and resistance measurement with temperature, capacitance, frequency and diode testing. It also provides non-contact voltage detection with audible and visual alarms for safer outlet and wire checks. The kit includes test leads, a thermocouple probe, safety tubes and batteries so it is ready for immediate use by DIYers, homeowners and professional electricians.

Sustained Operation Behaviour

Auto-ranging removes the need to manually select scales during long troubleshooting sessions, letting the meter settle on the correct range automatically. True RMS circuitry maintains accuracy on distorted waveforms commonly found in automotive charging systems and variable-speed drives. An automatic power-off after 15 minutes of inactivity preserves the supplied batteries during extended jobs.

Upgrade Path And Limitations

This unit replaces basic analog or fixed-range digital meters that lack True RMS, temperature input or non-contact voltage alerts. It is not suited for users who require a clamp-style current probe for high-amperage conductors without breaking the circuit, nor for bench work demanding higher count resolution or data-logging capability.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 67% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameaFe Power
Product typeClamp
Size & build
Overall height6.8 L x 14 W x 4.3 H centimeters
Overall width6.8 L x 14 W x 4.3 H centimeters
Overall length6.8 L x 14 W x 4.3 H centimeters
Product weight300 g
More details
Team affiliation1 Piece

Questions about this item

How much power does the T21D draw when it runs all day on its included batteries?

The meter powers itself from the supplied batteries and shuts off automatically after 15 minutes of inactivity to conserve them.

What leads or probes must I already have to start measuring with the T21D?

Test leads, a thermocouple probe and safety tubes are included in the box, so no extra accessories are required.

Will the T21D's 6000-count True RMS display work reliably with older automotive wiring I keep in the garage?

Yes, the auto-ranging function and True RMS chip give accurate AC and DC readings on legacy circuits without manual range selection.

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