EXTECH MA443-NIST, 400A True RMS AC Clamp Meter and NCV with NIST


Price $169.99
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Extech Test & Measurement

Clamp Meter with Non-Contact Voltage Detector and Type K - with NIST

Three models to choose from, with or without True RMS and AC or AC/DC Current functions. Choose True RMS model for accurate readings of non-sinusoidal waveforms, model with DC Current function for automotive applications, or model with Type K function when applications require Temperature measurements. The MA440 Series meters are fully loaded with multimeter functions and built-in non-contact voltage (NCV) detector to meet your application needs!


  • True RMS feature for accurate readings regardless of waveforms
  • 1.2" (30mm) jaw size fits conductors up to 500MCM
  • Built-In Non-Contact Voltage Detector (NCV)
  • Large backlit LCD display and built-in Flashlight
  • Functions include: NCV, AC/DC Voltage, AC Current, Resistance, Capacitance, Frequency, Type-K Temperature, Diode Test, Continuity
  • Relative mode for Capacitance, Data Hold, Max/Min, Auto Power Off and Low Battery Indicator
  • Complete with test leads, three AAA batteries, general purpose Type K temperature probe and pouch


  • AC Current: 400.0A (1mA) True RMS
  • DC Current: —
  • Basic Current Accuracy: AC: ±1.8%
  • DC Voltage: 600V (0.1mV) True RMS
  • AC Voltage: 600V (1mV)
  • Basic Voltrage Accuracy: AC: ±1.2% DC: ±0.8%
  • Non-Contact Voltage (NCV): 100 to 600V
  • Resistance: 40MΩ (0.1Ω)
  • Capacitance: 40mF (0.01nF)
  • Frequency: 1MHz (0.01Hz)
  • Temperature (Type K - meter range): -40° to 1832°F/-40° to 1000°C (1°)
  • Duty Cycle: Yes
  • Diode/Continuity: Yes
  • Dimensions: 9x3x1.6" (228x77x41mm)
  • Weight: 9.3oz (265g)