Multimeter UNI-T UT139C

The UNI-T UT139C is a new professional multimeter with True RMS classification and CAT III 600V protection designed for the needs of electricians to measure LV distribution networks in buildings. Innovative and industrial design with protective sleeve ensures impact resistance of the multimeter. The instrument includes a number of extra features such as low impedance voltage measurement (LoZ) (for variants UT139E + UT139S), variable frequency voltage measurement (VFC) (for variants UT139E + UT139S), contactless voltage measurement (NCV), capacitor capacitance measurement, frequency ratio measurement, or temperature measurement. Large and well-arranged LCD TN backlit display ensures better display of measured values. The display range is ± 6,000, for capacitance and frequency 9999. Refresh rate 2 to 3 times per second. The fuses are protected by tube fuses (range 10A fuse FF 10A H / 600V (6 x 25mm); range mA / µA fuse FF 600mA H / 600V (6 x 32mm)). The multimeter is powered by two AA 1.5V alkaline batteries. The measuring range can be selected automatically or manually. Included are test leads with spikes, K-type thermocouple and batteries.

UT139C is the ideal choice if you want a professionally equipped multimeter with a range of premium features that is also accurate, clear, safe and very easy to use.


Product parameters (multimeter function) :

- True RMS measurement (instrument measures RMS value of AC and voltage)
- AC voltage ranges measurement (AC 45 Hz to 1kHz) : 60 mV / 600 V
- AC current ranges measurement (AC 45 Hz to 1kHz) : 600 μA / 10 A
- DC voltage ranges measurement : 60 mV / 600 V
- DC current ranges measurement : 600 μA / 10 A
- ranges resistance measurement : 600 Ω / 60 MΩ
- ranges capacitor capacity measurement : 9.999 nF / 99.99 mF
- capacity measurement in relative mode (REL)
- Option to connect optional clamp for current measurement up to 60A AC / DC
- line continuity test (buzzer)
- test of diodes and semiconductor transitions at 3.2V
- non-contact voltage measurement (NCV)
- duty cycle measurement (DCL)
- automatic and manual range selection
- detection of opposite polarity
- Data hold function
- display minimum and maximum values
- display backlight
- automatic shutdown when idle
- Low battery indication
- overload protection, fuse protection

Technical parameters :

- DC voltage measurement ( input impedance according to range 3 to approx. 10MΩ ) :
(range / resolution / accuracy )
60.00 mV / 0.01mV / ±0.5 % + 3
600.0 mV / 0.1 mV / ± 0.5 % + 2
6.000 V / 1 mV / ± 0.7 % + 3
60.00 V / 0.01 V / ± 0.7 % + 3
600.0 V / 0.1 V / ± 0.7 % + 3


- AC voltage measurementí ( input impedance according to range 3 to approx. 10MΩ ) :
( range / resolution / accuracy )
60.00 mV / 0.01 mV / ± 1.0 % + 3
600.0 mV / 0.1 mV / ± 1.0 % + 3
6.000 V / 0.001 V / ± 0.8 % + 3
60.00 V / 0.01 V / ± 0.8 % + 3
600.0 V / 0.1 V / ± 0.8 % + 3
VFC 200 to 600.0 V / 0.1 V / ± 4.0 % + 3


- DC current measurement :
( range / resolution / accuracy )
600.0 μA / 0.1 μA / ± 0.7 % + 2
6000 μA / 1 μA / ± 0.7 % + 2
60.00 mA / 0.01 mA / ± 0.7 % + 2
600.0 mA / 0.1 mA / ± 0.7 % + 2
6.000 A / 0.001 A / ± 1.0 % + 3
10.00 A / 0.01 A / ± 1.0 % + 3


- AC current measurement :
( range / resolution / accuracy )
600.0 μA / 0.1 μA / ± 1.0 % + 3
6000 μA / 1 μA / ± 1.0 % + 3
60.00 mA / 0.01 mA / ± 1.0 % + 3
600.0 mA / 0.1 mA / ± 1.0 % + 3
6.000 A / 0.001 A / ± 1.2 % + 3
10.00 A / 0.01 A / ± 1.2 % + 3


- Resistance measurement :
( range / resolution / accuracy )
600.0 Ω / 0.1 Ω / ± 1.0 % + 2
6.000 kΩ / 0.001 kΩ / ± 0.8 % + 2
60.00 kΩ / 0.01 kΩ / ± 0.8 % + 2
600.0 kΩ / 0.1 kΩ / ± 0.8 % + 2
6.000 MΩ / 0.001 MΩ / ± 1.2 % + 3
60.00 MΩ / 0.01 MΩ / ± 1.5 % + 5


- Capacitance measurement :
( range / resolution / accuracy )
9.999 nF / 0.001 nF / při REL módu ± 4 % + 10
99.99 nF až 999.9 µF / 0.01 nF až 0.1 µF / ± 4 % + 10
9.999 mF až 99.99 mF / 0.001 mF až 0.01 mF / ± 10 %


- Frequency and duty cycle measurement :
( range / resolution / accuracy )
9.999 Hz až 9.999 MHz / 0.001 Hz až 0.001 MHz / ± 0.1 % + 4
0.1 % až 99.9 % / 0.1 % / Reference only


- Temperature measurement in °C :
( range / resolution / accuracy )
- 40 až 40°C / 1°C / ± 4
> 40 až 500°C / 1°C / ± 1.0 % + 4
> 500 až 1000°C / 1°C / ± 2.0 % + 4


- Temperature measurement in °F :
( range / resolition / accuracy )
- 40 až 104°F / 1°F / ± 5
> 104 až 932°F / 1°F / ± 1.5 % + 5
> 932 až 1832°F / 1°F / ± 2.5 % + 5

- With the thermostatic probe (cell type K), only temperatures up to 230°C

- Display type : LCD TN
- Display diagonal : 68 mm
- Sampling frequency : 3 / s
- Number of digits : 6000
- Multimeter dimensions : 170 x 80 x 48 mm
- Power supply : 2 x AA 1.5 V battery (included)
- Thermal probe with type K (included)
- Test leads with tips (included)
- Fuse F1 : 6 x 32 mm FF 600 mA H 600 V (installed)
- Fuse F2 : 6 x 25 mm FF 10 A H 600 V (installed)
- Fall resistance : 1 m
- Weight: approx. 354 g (including batteries)
- Operating temperature: - 10 to 50°C
- The device meets following standards:
cETLus, CAT III 600V, double insulation, overload protection 600V-PTC, pollution class II
EN 61326-1: 2013; EN 61326-2-2: 2013
EN 61010-1: 2010; EN 61010-2-030: 2010; EN 61010-2-033: 2012
Complies with UL STD standards: 61010-1, 61010-2-030
Certified by CSA STD. C22.2 No. 61010-1, 61010-2-030, 61010-2-033


Package contents :

- multimeter UT139C with impact plastic cover
- 2 x AA 1.5 V batteries
- F1 fuse: 6 x 32mm FF 600mA H 600V (in device)
- F2 Fuse: 6 x 25mm FF 10A H 600V (in device)
- thermo probe with cell type K (included)
- test leads with spikes (included)
- instructions for use in Czech, Slovak and English