Professional Electrical Testing with Enhanced Visualization
The UNI-T UT139S delivers professional-grade functionality with enhanced measurement capabilities designed for electrical professionals. With its True RMS accuracy, LoZ ghost voltage detection, and specialized functions like temperature measurement, this reliable multimeter provides electricians, maintenance technicians, and electronics hobbyists with comprehensive functionality for accurate electrical diagnostics in diverse environments.
Key Features
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True RMS Measurement: Accurate readings on modern electronic loads and distorted waveforms
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LoZ (Low Impedance) Function: Eliminates ghost voltage readings in high-capacitance systems
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Full Range Protection: Comprehensive safety features for both user and instrument
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EBTN Display: High-contrast black display for excellent visibility in dark environments
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31-Segment Analog Bar: Visual indication of changing values and trends
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Temperature Measurement: Built-in capability for thermal diagnostics up to 1000°C
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High Resolution Display: 6000 count precision for detailed measurements
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10A Current Range: Comprehensive capability for load testing
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LPF (Low Pass Filter): Removes high-frequency noise for cleaner measurements
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Non-Contact Voltage Detection: Quickly check electrical status through electromagnetic field detection
Enhanced Measurement Capabilities for Electrical Professionals
The UNI-T UT139S expands upon essential multimeter functions with specialized capabilities designed for comprehensive electrical system analysis. With excellent DC voltage accuracy of ±(0.5%+2), True RMS AC measurement with extended bandwidth (45-400Hz), and integrated temperature measurement (-40°C to 1000°C), the UT139S delivers the functionality needed for thorough equipment diagnostics and troubleshooting.
The high-contrast EBTN black display provides clear visibility in varied lighting conditions, especially in dark environments, while the responsive 31-segment analog bar graph provides visual indication of changing values. This combination of digital precision and analog-style visualization makes the UT139S ideal for both precise measurement and dynamic system evaluation.
Specialized Electrical Testing Functions
The UNI-T UT139S includes a dedicated LoZ (Low Impedance) voltage measurement function that allows electricians to quickly verify the presence of actual voltages by eliminating ghost voltage readings. This capability is essential when troubleshooting complex electrical systems, preventing false readings and ensuring accurate diagnostics.
With an extended frequency response of 45-400Hz for both voltage and current measurements, the UT139S provides accurate readings on variable frequency drive systems, allowing technicians to properly evaluate modern electronic equipment. This expanded capability makes the UT139S particularly valuable in environments with electronic controls and variable speed drives.
Professional Applications
Electrical Installation
Electricians rely on the UT139S for comprehensive system evaluation:
- Voltage and current verification for circuits
- Continuity testing of connections
- Ghost voltage elimination with LoZ function
- Non-contact voltage detection for safety
Electronics Repair
Electronics technicians leverage advanced functions for component testing:
- Component verification with resistance and capacitance measurement
- Signal integrity testing with frequency measurement
- Circuit board diagnostics with continuity and diode test
- Power supply troubleshooting with voltage accuracy
HVAC System Diagnostics
HVAC technicians utilize multiple measurement capabilities:
- Motor and compressor current measurement
- Temperature verification at critical points
- Capacitor testing for motor start/run components
- Control circuit diagnostics with voltage and resistance measurements
Technical Specifications
| Measurement |
Range |
Accuracy |
| DC Voltage (V) |
600V |
±(0.5%+2) |
| AC Voltage (V) |
600V |
±(0.8%+3) |
| DC Current (A) |
10A |
±(0.7%+2) |
| AC Current (A) |
10A |
±(1%+3) |
| Resistance (Ω) |
60MΩ |
±(0.8%+2) |
| Capacitance |
99.99mF |
±(4%+5) |
| Frequency |
10Hz~10MHz |
±(0.1%+4) |
| Temperature (°C) |
-40°C to 1000°C |
±(1%+4) |
| Temperature (°F) |
-40°F to 1832°F |
±(1.5%+5) |
| Duty Cycle |
0.1%~99.9% |
±(1.2%+5) |
Additional Features
- Display Count: 6000
- Display Type: EBTN (black display)
- Auto/Manual Range
- Bandwidth: 45Hz~400Hz
- NCV/Continuity Buzzer
- Diode Test: Around 3V
- LPF/LoZ (ACV): CAT III 300V, CAT II 600V
- Analog Bar Graph
- Power Supply: 1.5V battery (R6) x 2
- Display Size: 58 x 36mm
- Product Dimensions: 170 x 80 x 48mm
- Product Weight: 345g
Package Contents
- UNI-T UT139S True RMS Digital Multimeter
- Test Leads
- Temperature Probe
- 1.5V Batteries (R6) x 2
- User Manual (English)
- Gift Box Packaging
Support and Warranty
UNI-T stands behind the UT139S with comprehensive technical support and one-year warranty. Our dedicated support team is available to assist with application questions, measurement techniques, and warranty service.
Advanced Measurement for Electrical Professionals
The UNI-T UT139S True RMS Digital Multimeter combines essential electrical measurements with specialized functions in a professional package designed for electricians. With true RMS accuracy, temperature measurement, and EBTN display, it delivers reliable performance for professionals who need comprehensive diagnostic capabilities in a wide range of applications.
Order Your UNI-T UT139S Today and Experience Professional Electrical Measurement Capabilities
