Uni-T UT139C Digital Multimeter | NCV Voltage Detector, Temperature Measurement, Auto-Range AC/DC Tester for Electrical, HVAC & Industrial Diagnostics

Product Overview

The Uni-T UT139C Digital Multimeter is a True RMS smart electrical testing instrument engineered for electricians, HVAC technicians, maintenance engineers, and industrial professionals who demand accuracy, safety, and reliability. Designed for real-world diagnostics, the UT139C delivers full-range AC/DC measurement, non-contact voltage (NCV) detection, and temperature sensing in a rugged, easy-to-use handheld form factor.

Built with advanced auto-ranging technology and True RMS measurement capability, this multimeter ensures precise readings even on non-linear loads, making it ideal for modern electrical systems, HVAC troubleshooting, control panels, and industrial maintenance environments.

Key Features & Advantages

True RMS Accurate Measurement
Ensures reliable and precise readings for AC voltage and current, even with distorted waveforms common in inverters, VFDs, and industrial equipment.

NCV Non-Contact Voltage Detection
Safely detects live AC voltage without physical contact, improving operator safety during electrical inspection, fault finding, and wire tracing.

Auto-Range Smart Functionality
Automatically selects the correct measurement range, reducing setup time and minimizing user error in fast-paced work environments.

Temperature Measurement Capability
Supports temperature testing with an external probe, making it ideal for HVAC systems, motors, transformers, and thermal diagnostics.

High-Visibility LCD Display
Large, clear digital screen with backlight ensures easy reading in low-light areas such as electrical panels, basements, and industrial sites.

Robust Safety Design
Engineered with high safety standards suitable for professional electrical work, protecting both the user and the device during live testing.

Compact & Ergonomic Build
Lightweight yet durable housing allows comfortable one-hand operation, perfect for field technicians and mobile service engineers.

Technical Specifications

• Model: Uni-T UT139C

• Measurement Type: Digital Multimeter (True RMS)

• Voltage Measurement: AC / DC

• Current Measurement: AC / DC

• Resistance Measurement: Supported

• NCV Function: Yes (Non-Contact Voltage Detection)

• Temperature Measurement: Yes (with temperature probe)

• Range Selection: Auto-Range

• Display: Digital LCD with backlight

• Usage Category: Electrical, HVAC, Industrial, Maintenance

• Form Factor: Handheld Portable Meter

Applications & Use Cases

• Electrical installation and maintenance

• HVAC system diagnostics and servicing

• Industrial machinery inspection

• Control panel and switchgear testing

• Automotive electrical troubleshooting

• Residential and commercial electrical work

• Technical training and laboratory use