UNI-T Multimeter - UT139C
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Product Information
Full details
The UNI-T UT139C is designed for electrical professionals and hobbyists who require accurate, reliable measurements in a durable package. Its standout feature is its True-RMS capability, which ensures precise readings for non-linear electrical signals, though users should note that the device requires manual battery installation before the first use.
All features
| Model Part Number | UT139C |
|---|---|
| Brand | UNI-T |
Extended Product Information
FAQs
What does True-RMS mean?
True-RMS allows the meter to calculate the effective value of AC voltage or current even when the waveform is distorted or non-sinusoidal.
Does this meter measure temperature?
Yes, it comes with a dedicated temperature probe that connects to the meter to provide direct readings.
Can I use this for automotive troubleshooting?
Yes, the DC voltage, resistance, and continuity functions are ideal for diagnosing automotive electrical systems.
How do I activate the NCV feature?
Select the NCV function on the dial and move the top of the meter near a wire; it will alert you to the presence of voltage.
Is the backlight always on?
No, the backlight is manual and will turn off automatically to conserve battery life.
Troubleshooting
Device does not turn on.
Ensure the AA batteries are installed with correct polarity and are not depleted.
Readings are inconsistent or fluctuating wildly.
Check the condition of the test leads and ensure they are firmly seated in the input jacks.
Screen is difficult to read.
Press the backlight button to illuminate the display and ensure the unit is not in low-battery mode.
Pros and Cons
Pros
- Durable build with protective rubber housing
- Precise True-RMS readings
- Wide range of measurement functions
- Backlit display is highly visible
- Energy-saving auto-power-off functionality
Cons
- Requires manual installation of AA batteries
- Standard test leads are basic
- Not intended for high-voltage industrial utility grid work
Setup, Compatibility & Care
To set up the UT139C, remove the protective casing, open the battery compartment on the rear, and install the two 1.5V AA batteries. Ensure the test leads are inserted into the correct terminals based on the desired measurement mode (e.g., 'COM' for ground and 'VΩ' for voltage or resistance). To maintain the device, store it in a dry, room-temperature environment, and periodically clean the exterior with a soft, dry cloth. Never submerge the device in liquid or expose it to extreme temperatures beyond its operational rating.