Digital Multimeters

Technician Digital Multimeters

The Digital Multimeters category showcases the primary diagnostic instruments HVAC technicians use to measure voltage, resistance, continuity, capacitance, temperature, frequency and more. A dependable multimeter is essential for troubleshooting control circuits, verifying power, checking capacitors and testing safety switches.

This selection includes HVAC-specific multimeters with microamp (µA) ranges for flame sensors, True RMS meters for modern variable-speed systems, and advanced DMMs with temperature and capacitor testing. Many units offer low-Z input, backlit displays, min/max capture, NCV detection, and CAT III / CAT IV safety ratings for safe use around energized equipment.

• HVAC digital multimeters with temperature, capacitance and microamp ranges.
• True RMS multimeters for accurate readings on ECM and inverter-driven systems.
• DMMs with low-Z mode to reduce ghost voltage and improve accuracy.
• Advanced multimeters with frequency, duty cycle, diode and data-hold modes.
• Technician kits that bundle meters with leads, clips and thermocouples.

When choosing a digital multimeter, consider True RMS capability, AC/DC voltage and current ranges, capacitance range (for HVAC capacitors), microamp measurement, temperature input, resolution, backlight visibility, and CAT safety rating. A properly equipped DMM is crucial when diagnosing control faults, start components and low-voltage issues.

Pro tip: Carry a multimeter that includes a microamp (µA) range for testing flame sensors, plus capacitance mode for verifying compressor and fan capacitors. A True RMS meter is recommended for all modern inverter and ECM-driven HVAC systems.