UNI-T UT139C True RMS Digital Multimeter
The UNI-T UT139C True RMS Digital Multimeter is a versatile handheld measuring instrument designed for professionals, technicians, students, and electronics enthusiasts. It provides accurate measurements of AC/DC voltage, AC/DC current, resistance, capacitance, frequency, temperature, and more. True RMS technology ensures precise readings even when measuring non-linear AC waveforms commonly found in modern electronic equipment and switching power supplies.
Built with user-friendly features such as an automatic backlit LCD display, NCV (Non-Contact Voltage) detection, continuity buzzer, diode testing, and automatic ranging, the UT139C simplifies electrical troubleshooting while maintaining excellent safety standards. Its rugged construction, ergonomic design, and reliable measurement performance make it suitable for industrial maintenance, electrical installations, laboratory work, automotive diagnostics, and educational applications.
Features:
- MAX/MIN/REL modes.
- Data hold, LED backlight, auto power off.
- Full range protection (600V).
- True RMS.
- NCV.
- Auto/manual ranges selectable.
- Measures AC and DC voltage.
- Measures AC and DC current.
- Resistance measurement.
- Capacitance measurement.
- Frequency measurement.
- Temperature measurement..
- Diode testing.
- Continuity buzzer.
- Data Hold function.
- Relative measurement mode.
- MAX/MIN recording.
- Auto power-off.
- Low battery indication.
- Input protection for improved safety.
- Ergonomic handheld design.
Specifications:
| Specifications | Range | UT139A | UT139B | UT139C | UT139S |
| DC voltage (V) | 600V | ±(0.5%+2) | ±(0.5%+2) | ±(0.5%+2) | ±(0.5%+2) |
| AC voltage (V) | 600V | ±(1%+3) | ±(0.8%+3) | ±(0.8%+3) | ±(0.8%+3) |
| DC current (A) | 10A | ± (0.7%+2) | ±(0.7%+2) | ±(0.7%+2) | ±(0.7%+2) |
| AC current (A) | 10A | ±(1%+3) | ±(1%+3) | ±(1%+3) | ±(1%+3) |
| Resistance (Ω) | 20MΩ | ±(1%+2) | |||
| 40MΩ | ±(0.8%+2) | ||||
| 60MΩ | ±(0.8%+2) | ±(0.8%+2) | |||
| Capacitance (F) | 99.99mF | ±(4%+5) | ±(4%+5) | ±(4%+5) | |
| Frequency (Hz) | 10Hz~10MHz | ±(0.1%+4) | ±(0.1%+4) | ±(0.1%+4) | |
| Temperature (°C) | -40°C~1000°C | ±(1%+3) | ±(1%+4) | ||
| Temperature (°F) | -40°F~1832°F | ±(1.5%+5) | ±(1.5%+5) | ||
| Features | |||||
| Display count | 2000 | 4000 | 6000 | 6000 | |
| Auto range/Manual range /True RMS |
√ | √ | √ | √ | |
| Bandwidth (Hz) | 45Hz~400Hz | 45Hz~1kHz | 45Hz~1kHz | 45Hz~400Hz | |
| NCV/Continuity buzzer | √ | √ | √ | √ | |
| Duty cycle | 0.1%~99.9% | √ | √ | √ | |
| Diode | Around 2V | Around 3V | 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 |
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| 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 | ||||
Applications:
- Frequency measurement.
- NCV measurement.
- Resistance measurement.
- Voltage measurement.
Package Includes:
- UNI-T UT139C True RMS Digital Multimeter.
- An operating instruction manual.
- A test pen (CAT III 600V) 10 A.
- Point-type K (nickel chromium ~ nickel silicon) thermocouple (UT139C only).
- An optional current clamp (UT139C only).