Extech 400A AC True RMS Clamp Meter and NCV

Extech 400A AC True RMS Clamp Meter and NCV


The Extech 400A is an integrated non-contact voltage detector that quickly checks for the presence of live wires before testing.


  • Built-in non-contact voltage detector with LED alert
  • Compact size allows measurements in tight locations
  • True RMS for accurate readings of non-sinusoidal waveforms
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The Extech 400A features a built-in non-contact voltage detector with LED alert on a 4000 count, backlit LCD display. It includes a 1.2" jaw size for conductors up to 350 MCM, as well as multimeter functions such as AC/DC voltage, resistance, capacitance, frequency, temperature, duty cycle, diode, and continuity.

Notable Specifications:
  • Display counts range: 4000
  • AC current range: 40.00A, 400.0A
  • AC current max resolution: 0.01A
  • AC current basic accuracy: ±(2.5% + 8d)
  • AC voltage range: 4.000V, 40.00V, 400.0V, 600V
  • AC voltage max resolution: 0.001V
  • AC voltage basic accuracy: ±(1.8% + 8d)
  • DC voltage range: 400.0mV, 4.000V, 40.00V, 400.0V, 600V
  • DC voltage max resolution: 0.01mV
  • DC voltage basic accuracy: ±(0.8% + 2d)
  • Resistance range: 400.0Ω, 4.000kΩ, 40.00kΩ, 400.0kΩ,4.000MΩ, 40.00MΩ
  • Resistance max resolution: 0.1Ω
  • Resistance basic accuracy: ±(0.8% + 2d)
  • Frequency range: 10Hz to 10kHz
  • Frequency max resolution: 0.01Hz
  • Frequency basic accuracy: ±(1.5% + 2d)
  • Capacitance range: 40.00nF, 400.0nF, 40.00μF, 100.0μF
  • Capacitance max resolution: 0.01nF
  • Capacitance basic accuracy: ±(3.0% + 5d)
  • Temperature range: -4 to 1400°F (-20 to 760°C)
  • Temperature max resolution: 0.1°
  • Temperature basic accuracy: ±(3% + 9°F/5°C)
  • Duty cycle: 0.5 to 99.0%
  • Duty max resolution: 0.1%
  • Duty basic accuracy: ±(1.2% + 2d)
  • Diode: yes
  • Continuity: yes
  • Dimensions: 7.9x2.6x1.5" (200x66x37mm)
  • Weight: 7.2oz (205g)
What's Included:
  • (1) Clamp meter
  • (1) Test leads
  • (1) General purpose type K bead wire temperature probe
  • (2) AAA batteries
  • (1) Carrying case
Image Part # Product Description Price Stock Order
Extech 400A AC True RMS Clamp Meter and NCV MA410T AC true RMS clamp meter + NCV
Drop ships from manufacturer
Extech 400A AC True RMS Clamp Meter and NCV MA410T-NIST AC true RMS clamp meter + NCV, includes NIST calibration certificate
Drop ships from manufacturer

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