Fluke 378FC AC/DC TRMS Non-Contact Voltage Clamp - Fast Safer Testing

Our review finds the Fluke 378FC is aimed at electricians and maintenance technicians who need reliable, hands-off voltage and current checks in commercial or industrial settings. The single biggest reason to buy is its FieldSense technology, which lets the user measure voltage and current without contacting a live conductor, speeding routine checks while improving safety. In this review the tester proved especially useful for capture of three-phase conditions and spot checks where a quick, non-intrusive reading reduces lockout/tagout work and exposure to live panels.

Key Features

• FieldSense non-contact measurement: Allows voltage and current readings through the clamp jaw without touching a live conductor, reducing exposure during common tests.
• True-RMS accuracy: Provides correct readings on non-sinusoidal waveforms, which helps diagnose equipment running under distorted loads.
• Power quality indicator: Detects and displays power quality issues related to current, voltage, or power factor so the technician can identify faulty equipment or supply problems quickly.
• Complete 3-phase testing: Supports faster 3-phase voltage and current checks with fewer steps than traditional methods, saving time on routine inspections.
• iFlex compatibility: The included iFlex probe expands the measurement range and gives access to tight or large conductors for more flexible testing.

Who It's For

The Fluke 378FC is best for professional electricians, facilities maintenance staff, and service technicians who regularly work on commercial or industrial power systems and need quick, safer verification of live voltage and current. Its non-contact FieldSense method and power quality indicator are particularly useful when checking three-phase panels and troubleshooting equipment suspected of power-related faults.

Those who need laboratory-grade, bench-level precision or who perform highly sensitive calibration work should look elsewhere; some users report mixed accuracy for fine diagnostic measurements. Hobbyists who seldom encounter three-phase systems may also find the feature set more than required for occasional home use.

Pros & Cons

Pros

• FieldSense non-contact readings make tests faster and safer around live conductors.
• Power quality indicator helps pinpoint issues with voltage, current, or power factor without complex setup.
• True-RMS measurement and iFlex probe increase usefulness on distorted waveforms and awkward conductors.

Cons

• Some customers report mixed accuracy for fine measurements, so it may not replace lab instruments for precision work.

Specifications

Product type	AC/DC TRMS clamp meter with PQ indicator
Measurement method	FieldSense non-contact voltage and clamp jaw current
Power quality	PQ indicator for voltage, current, and power factor
Probe	Includes iFlex flexible current probe
Application	3-phase voltage and current testing
Safety focus	Faster, safer testing without touching live conductor

Our Verdict

The Fluke 378FC is a strong choice for professionals who need quick, safer on-site checks of voltage and current and want a simple way to surface power quality problems. It delivers practical value for field work and panel troubleshooting, though technicians requiring the highest precision should verify readings with a dedicated bench instrument.

Frequently Asked Questions

Can the 378FC measure without contacting a live conductor?
Yes. FieldSense technology provides voltage and current readings through the clamp jaw without touching the live conductor, improving safety during checks.

Does it identify power quality issues?
Yes. The PQ indicator detects and displays problems related to current, voltage, and power factor so users can quickly identify faulty equipment or supply issues.

Is this suitable for precision laboratory calibration?
No. While the 378FC offers True-RMS readings and solid field performance, some users report mixed accuracy for very fine measurements, so laboratory-grade instruments are preferable for calibration tasks.