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The UNI-T UT139B is a 3999-count True RMS digital multimeter for professional electrical testing and maintenance. It measures AC/DC voltage and current, resistance, capacitance, frequency and duty cycle, with VFC, NCV and automatic or manual ranging.
| Parameter | Range / Specification | Basic Accuracy |
|---|---|---|
| DC Voltage | 40 mV / 400 mV / 4 V / 40 V / 400 V / 600 V | ±(0.5% + 2) |
| AC Voltage | 40 mV / 400 mV / 4 V / 40 V / 400 V / 600 V | ±(0.8% + 3) |
| DC Current | 400 µA / 4000 µA / 40 mA / 400 mA / 4 A / 10 A | ±(0.8% + 2) |
| AC Current | 400 µA / 4000 µA / 40 mA / 400 mA / 4 A / 10 A | ±(1% + 3) |
| Resistance | 400 Ω / 4 kΩ / 40 kΩ / 400 kΩ / 4 MΩ / 40 MΩ | ±(0.8% + 2) |
| Capacitance | 9.999 nF / 99.99 nF / 999.9 nF / 9.999 µF / 99.99 µF / 999.9 µF / 9.999 mF / 99.99 mF | ±(4% + 5) |
| Frequency | 9.999 Hz to 9.999 MHz | ±(0.1% + 4) |
| Duty Cycle | 0.1% to 99.9% | — |
| Display | 3999 counts, 58 × 36 mm LCD | |
| AC Measurement Type | True RMS | |
| AC Bandwidth | 45 Hz to 1 kHz | |
| Ranging Modes | Automatic and manual ranging | |
| VFC Measurement | Variable-frequency voltage measurement | |
| Non-Contact Voltage Detection | NCV function | |
| Diode Test | Approximately 3 V test voltage | |
| Additional Functions | Continuity buzzer, MAX/MIN, relative mode, data hold, LCD backlight and low-battery indication | |
| Automatic Power-Off | After approximately 15 minutes | |
| Input Protection | 600 Vrms full-range input protection | |
| Safety Rating | CAT III 600 V, double insulation, Pollution Degree 2 | |
| Certifications | CE, UKCA, cETLus | |
| Power Supply | 2 × 1.5 V AA batteries | |
| Product Dimensions | 175 × 80 × 48.5 mm | |
| Product Weight | Approximately 370 g | |
| Product Colour | Red and grey | |
