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UNI-T UT139B True RMS Digital Multimeter

UNI-T UT139B True RMS Digital Multimeter

The UT139 Series True RMS Digital Multimeters feature MAX/MIN/REL modes, data hold, LED backlight, auto power off, full-range protection (600V), True RMS, NCV, and selectable auto/manual ranges. Certified with CE, UKCA, and cETLus for reliable measurements.
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  • MAX/MIN/REL modes
  • Data hold, LED backlight, auto power off
  • Full range protection (600V)
  • True RMS
  • NCV
  • Auto/manual ranges selectable
  • Certifications: CE, UKCA, cETLus

specification & comparison


Specifications Range UT139B UT139S
DC voltage (V) 600V ±(0.5%+2) ±(0.5%+2)
AC voltage (V) 600V ±(0.8%+3) ±(0.8%+3)
DC current (A) 10A ±(0.7%+2) ±(0.7%+2)
AC current (A) 10A ±(1%+3) ±(1%+3)
Resistance (Ω) 20MΩ    
40MΩ ±(0.8%+2)  
60MΩ   ±(0.8%+2)
Capacitance (F) 99.99mF ±(4%+5) ±(4%+5)
Frequency (Hz) 10Hz~10MHz ±(0.1%+4) ±(0.1%+4)
Temperature (°C) -40°C~1000°C   ±(1%+4)
Temperature (°F) -40°F~1832°F   ±(1.5%+5)
Display count   4000 6000
Auto range/Manual range  
/True RMS
Bandwidth (Hz)   45Hz~1kHz 45Hz~400Hz
NCV/Continuity buzzer  
Duty cycle 0.1%~99.9%
Diode   Around 3V Around 3V
LPF/LoZ (ACV)    
Analog bar    
General Characteristics
Power 1.5V battery (R6) x 2
Display 58mm x 36mm
Product color Red and grey
Product net weight UT139A/B/C: 354g; UT139S: 345g
Product size 170mm x 80mm x 48mm
Standard accessories UT139A/B: Batteries, test leads;
UT139C/S: Batteries, test leads, temperature probe
Standard individual packing Gift box, English manual
Standard quantity per carton 20pcs
Standard carton measurement 450mm x 330mm x 340mm
Standard carton gross weight 12.2kg
Optional accessory UT139C: Current sensor AC/DC 40A