Uni-T UT139B is a practical digital multimeter for everyday work in the workshop and in the field. It offers True RMS measurement for more accurate results, NCV for quick non-contact voltage detection, and a safety rating of CAT III 600 V. The clear display is complemented by an analog bar graph, so you can easily read values even during quick installation checks.
Accurate True RMS measurement for everyday and service work
Thanks to True RMS, the UT139B provides more accurate results even when measuring AC signals with non-sinusoidal waveforms. It is ideal for diagnosing power supplies, appliances, and installations where accuracy matters.
NCV and CAT III 600 V safety
The NCV function enables a quick non-contact check for the presence of voltage. The multimeter is designed for safe use in environments up to CAT III 600 V, making it a suitable choice for work on electrical distribution systems and servicing.
Clear display and useful measuring modes
The easy-to-read LCD is complemented by a bar graph for quick orientation. Practical functions such as Data Hold, Max/Min, relative mode, and backlight speed up work in the field and in the workshop.
The Uni-T UT139B digital multimeter is a reliable helper for service and electrical work. It combines simple operation with features you will appreciate when diagnosing wiring, appliances, and electronics. Thanks to True RMS, it measures more accurately even for non-sinusoidal waveforms, and the NCV function lets you quickly verify the presence of voltage without direct contact.
The UT139B offers both automatic and manual range selection and higher resolution (maximum reading 4000) for more convenient work. A display backlight and practical modes are also available to speed up measuring and value checking.
Main advantages and functions:
- AC/DC voltage measurement up to 600 V and AC/DC current up to 10 A
- Measurement of resistance, capacitance, and frequency
- Diode test and audible continuity test (buzzer)
- Data Hold, relative mode, Max/Min, duty cycle measurement
- V.F.C and auto power off
- Safety: CAT III 600 V
Package contents:
- digital multimeter
- 2× AA batteries
- 1 pair of test leads
Specifications
- Manufacturer
- Uni-T
- Model
- UT139B
- Type
- True RMS digital multimeter
- DC voltage (DC)
- 40 mV / 400 mV / 4 V / 40 V / 400 V / 600 V ±(0.5 % + 2)
- AC voltage (AC)
- 40 mV / 400 mV / 4 V / 40 V / 400 V / 600 V ±(0.8 % + 3)
- DC current (DC)
- 400 µA / 4000 µA / 40 mA / 400 mA / 4 A / 10 A ±(1.0 % + 2)
- AC current (AC)
- 400 µA / 4000 µA / 40 mA / 400 mA / 4 A / 10 A ±(1.2 % + 3)
- Resistance
- 400 Ω / 4 kΩ / 40 kΩ / 400 kΩ / 4 MΩ / 40 MΩ ±(1.0 % + 2)
- Capacitance
- 9.999 nF ~ 99.99 mF ±(4.0 % + 5)
- Frequency
- 10 Hz ~ 10 MHz ±(0.1 % + 4)
- Maximum reading
- 4000
- AC frequency range
- 45 Hz ~ 400 Hz
- Range selection
- Automatic and manual
- Functions
- True RMS, NCV, diode test, continuity buzzer, duty cycle, Data Hold, relative mode, Max/Min, LCD backlight, V.F.C
- Safety
- CAT III 600 V
- Power supply
- 2× 1.5 V AA batteries
- Weight
- 354 g
- Dimensions
- 175 × 81 × 48.5 mm
- Display size
- 58 × 36 mm
- Certifications
- CE, UKCA, cETLus
