Extech MA445 True RMS AC/DC Clamp Meter
by Extech
Last updated Mar 29, 2026 · 2 revisions
400A True RMS AC/DC clamp meter with 11 functions including capacitance, Type K temperature, NCV detector, and inrush current for HVAC field work.
5.9 - Good Custom · $98 4 Features
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About This Product
The Extech MA445 is a compact 400A True RMS AC/DC clamp meter with 11 measurement functions suited for HVAC technicians. It measures AC/DC voltage and current, resistance, capacitance, frequency, duty cycle, temperature via Type K thermocouple, and includes a non-contact voltage detector. The 1.2-inch jaw fits conductors up to 500 MCM, and the dual backlit display with inrush current mode simplifies motor startup diagnostics.
FSH Score Breakdown
Ease of Use 7.5
Features 7.0
Support 6.0
Value 7.5
Integrations 2.0
AI Capabilities 0.5
Customer Reviews
Features
4 features confirmed across
3categories· Showing confirmed capabilities only
Compliance & Safety2features
Static Pressure MeasurementMax/Min functionCombustion AnalysisBuilt-in Type K thermocouple input
Hardware Features1feature
Auto ShutoffAuto power off with disable
Technician Management1feature
Electrical Measurement TrackingNon-contact voltage (NCV) detector
Pricing
- Model
- Custom
- Starting at
- $98
- Notes
- Street price ~$98-$114 depending on retailer. True RMS 400A AC/DC clamp meter with 11 functions: AC/DC voltage, AC/DC current, resistance, diode, continuity, capacitance, temperature (Type K), frequency, duty cycle. 1.2" (30mm) jaw accommodates up to 500MCM conductors. 4000-count backlit LCD. NCV detector, built-in flashlight, Data Hold, MIN-MAX, Relative mode, DC Zero, Auto Power Off. Includes test leads, 3x AAA batteries, Type K temperature probe, pouch.
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