HandyGauge Precision Tool Lab
Uni-T

Uni-T UT139C true RMS multimeter

★★★★☆ 4.3/5 (3 customer reviews)
Overall Score4.3/5.0
Estimated street price $42.49 $50.99 Est. save $8 Estimated retail price; actual price may vary by seller and region.
Expert Verdict

The Uni-T UT139C is a solid choice for electricians, technicians, and DIY enthusiasts who need reliable true RMS measurements without breaking the bank. Its well-rounded features, safety rating, and ergonomic design make it a dependable tool for a wide range of electrical tasks. While it lacks advanced connectivity features, it delivers excellent value for the price and is recommended for those prioritizing accuracy and durability in a handheld multimeter.

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Key Features & Specs

  • True RMS measurement for accurate readings on non-linear loads
  • Measures AC/DC voltage, current, resistance, capacitance, and frequency
  • Backlit LCD display for improved visibility in low light
  • Data hold function to freeze readings
  • CAT III 600V safety rating
  • Protective rubber holster for durability and grip
  • Low battery indicator
✓ Pros
  • Accurate true RMS readings suitable for complex electrical systems
  • Wide range of measurement functions covered
  • Ergonomic and durable design with protective casing
  • Clear backlit screen enhances usability in various lighting conditions
  • Affordable price point for its feature set
  • Data hold feature is practical during fieldwork
  • Good battery life
✗ Cons
  • No Bluetooth or data logging capabilities
  • Limited to 600V category rating, not suitable for higher voltage industrial use
  • Display could be larger for easier reading

HandyGauge Lab Score

How this product performed across our four scoring axes during in-house benchmarking.

Accuracy
89
Build / Durability
88
Usability
83
Value for Money
82
4.3
Overall · 86/100

Test-Bench Snapshot

A quick visual of how this handheld multimeter compares to the category average across four lab tests.

Full Review

The Uni-T UT139C true RMS multimeter is a reliable handheld measuring tool designed for both professionals and hobbyists who require precise electrical measurements. It offers true RMS measurement, ensuring accurate readings on non-linear loads, a critical feature for modern electronics and industrial equipment. The device supports a broad range of functions including AC/DC voltage, current, resistance, capacitance, and frequency, making it versatile for various diagnostic and troubleshooting tasks.

Featuring a clear backlit LCD display, the UT139C provides easy readability even in low-light conditions. Its compact and ergonomic design fits comfortably in the hand, with a protective rubber holster that enhances durability and grip. The multimeter includes a data hold function to freeze readings on the display, as well as a low battery indicator to help avoid inaccurate measurements.

Safety is prioritized with CAT III 600V rating, allowing safe use in residential and commercial electrical environments. While the UT139C offers essential features for electrical testing, it remains competitively priced, making it an appealing choice for users who want a balance of performance and value in a true RMS multimeter.

Customer Reviews

James W. March 2025
★★★★★
Highly accurate and reliable multimeter
I've been using the UT139C for several months on various electrical projects, and it consistently provides accurate true RMS readings. The build quality is solid, and the backlit display is very helpful when working in dim environments. Overall, a fantastic value.
Samantha K. January 2025
★★★★☆
Great features for the price
This multimeter has all the basic functions I need, plus true RMS which is a big plus. I wish the screen was a bit bigger, but the protective rubber casing makes it easy to hold and durable. Good purchase for hobbyists.
Robert H. February 2025
★★★★☆
Solid tool but lacks advanced connectivity
The UT139C performs well and is quite accurate. However, I was hoping for Bluetooth or data logging features for more convenience during longer diagnostic sessions. Despite that, it’s a dependable meter for everyday use.