400A True RMS AC/DC Clamp Meter with NCV

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  • Jameco Part no.: 2278559
  • Manufacturer: Extech Instruments
  • Manufacturer no.: MA445
  • HTS code: 9030310000
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400A True RMS AC/DC Clamp Meter with NCV

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

The MA445 is a 400A AC/DC True RMS Clamp meter with 11 functions including DC Current, TRMS AC measurements, and Type K Thermocouple. This meter measures AC/DC voltage, AC current, DC current, resistance, diode, continuity, capacitance, temperature, frequency, and duty cycle. In addition, this metes offers Display hold, MIN/MAX, Relative mode, NCV (non‐contact voltage detection), and automatic power OFF.

In addition to the meter, the packaging includes Instructional documentation (Quick Start), Test Leads, K‐type temperature probe, batteries, and a pouch.


  • 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/DC Current, Resistance, Capacitance, Frequency, Type-K Temperature, Diode Test, Continuity
  • Relative mode for Capacitance, DC Zero and Offset Adjustment, 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 (10mA) True RMS
  • DC Current: 400.0A (10mA)
  • Basic Current Accuracy: AC: ±2.5%, DC: ±2.0%
  • DC Voltage: 600V (0.1mV) True RMS
  • AC Voltage: 600V (1mV)
  • Basic Voltage 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: 9 x 3 x 1.6" (228 x 77 x 41 mm)
  • Weight: 9.3oz (265g)

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Specification Value
Display Digits3.5
Display Count6000
FunctionVoltage, Current, Resistance, Capacitance, Temperature, Continuity, Diode Test

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