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Multimeter Digital ECG DM-21


Best Voltmeter! Economical Digital Meter



Low cost general purpose meter.


  • Transistor hFE
  • Diode Test
  • LED Test
  • Square Wave Generator
  • 7 Functions, 11 Ranges
  • 0.8% Basic DC Accuracy
  • 3 1/2 Digit LCD, 0.55″ H
  • Low Power Ω
  • Overload Protection
  • RF Shielded
  • Polarity Indicator
  • Low Battery Indicator
  • Tilt Stand
  • 1-Year Limited Warranty

Battery, Test Leads (ML-375) and Operating Instructions Included


Display: 3 1/2 Digit LCD, 0.55″ high,
with polarity
Overrange Indication: “1” or “–1” is displayed.
Measurement Rate: 2.5 times per second
Operating Environment: 0°C to 50°C, <70%
relative humidity
Storage Environment: -20°C to 60°C, <80%
relative humidity with battery removed

Power: 9V carbon zinc battery (NEDA 1604)
Battery Life: 150 hours typical
with carbon zinc cells
Low Battery Indicator: Symbol is displayed
Dimensions, Weight: 2.8″ wide x 6″ long x 1.5″
thick (70mm x 151mm x 38mm),
net weight 7oz. (200g)

DC Voltage
Range Resolution Accuracy
2V 1mV ±0.8% of rdg ±1D
20V 10mV ±0.8% of rdg ±1D
200V 100mV ±0.8% of rdg ±1D
600V 1V ±0.8% of rdg ±1D
Input Impedance: 1MΩ on all ranges.
Maximum Input: 600V DC or 500AC rms.
AC Voltage
Range Resolution Accuracy
200V 100mV ± 1.5% of rdg ±4D
500V 1V ± 1.5% of rdg ±4D
Input Impedance: 450KΩ on all ranges.
Maximum Input: 600V DC or 500AC rms.
Frequency Range: 50Hz – 500Hz.

Range Resolution Accuracy
200Ω 0.1Ω ±1.5% of rdg ±3D
2KΩ 1Ω ±1.5% of rdg ±3D
20KΩ 10Ω ±1.5% of rdg ±3D
200KΩ 100Ω ±1.5% of rdg ±3D
2MΩ 1KΩ ±1.5% of rdg ±3D
Overload Protection: 500V DC or 350AC rms
Transistor hFE Test (PNP, NPN)
Test Condition: 10μA Base Current @ <3.5V
hFE Range: 0 – 1000
Diode Test
Voltage: <3.5V @ 1mA ±0.6mA

LED Test
Voltage: <3.5V @ 10mA ±0.6mA
Waveform: Square
Frequency: 50Hz approx
Output: ±3 to -0.5V DC, 50% Duty Cycle
Impedance: 120KΩ

Availability: 3 days

Order No. DM-21



Authorized NTE Distributor