UNI-T UT139S True RMS digitale multimeter 6000 Counts EBTN-display CAT III 600V

The UNI-T UT139S is a professional-grade digital multimeter designed for electricians, engineers, and technicians who demand accuracy and reliability. Featuring a 6000-count EBTN black display with backlight, True RMS measurement, and a wide range of functions, this meter is ideal for troubleshooting electrical systems, industrial maintenance, and laboratory use. With safety ratings of CAT III 600V and CAT II 1000V, it ensures safe operation in demanding environments.

Advantages

The UT139S offers exceptional value with its combination of advanced features and robust build quality. The enhanced background twisted nematic (EBTN) display provides excellent readability even in low-light conditions, while the True RMS capability ensures accurate measurements of non-sinusoidal waveforms. Auto ranging simplifies operation, and the built-in NCV (non-contact voltage) detection enhances safety by allowing you to identify live wires without direct contact. The low-pass filter (V.F.C mode) is perfect for variable frequency drive measurements.

Suitable for

• Electrical troubleshooting in residential, commercial, and industrial settings
• HVAC system diagnostics and repair
• Automotive electrical system testing
• Electronics hobbyists and makers
• Laboratory and educational environments

Key specifications

• Display Count: 6000 counts
• Display Type: EBTN Black Display with Backlight
• True RMS: Yes
• DC Voltage Range: 600mV / 6V / 60V / 600V / 1000V
• AC Voltage Range: 600mV / 6V / 60V / 600V / 750V
• DC Current Range: 600µA / 6000µA / 60mA / 600mA / 6A / 10A
• AC Current Range: 600µA / 6000µA / 60mA / 600mA / 6A / 10A
• Resistance Range: 600Ω / 6kΩ / 60kΩ / 600kΩ / 6MΩ / 60MΩ
• Capacitance Range: 9.999nF / 99.99nF / 999.9nF / 9.999µF / 99.99µF / 999.9µF / 9.999mF / 99.99mF
• Frequency Range: 10Hz ~ 10MHz
• Temperature Range: -40°C ~ 1000°C (-40°F ~ 1832°F)
• Diode Test: Yes
• Continuity Test: Yes (with buzzer)
• NCV (Non-Contact Voltage): Yes
• Low Pass Filter (LPF): Yes (V.F.C mode)
• Auto Ranging: Yes
• Data Hold: Yes
• MAX/MIN Mode: Yes
• Safety Rating: CAT III 600V, CAT II 1000V
• Power Supply: 2 x 1.5V AA batteries

Recommendations

For best results, use high-quality AA alkaline batteries and replace them when the low battery indicator appears. Always follow safety precautions when measuring high voltages or currents. The included test leads are suitable for most applications, but for specialized tasks, consider using silicone-insulated leads for added durability.