HVAC contractors know that a digital amp multimeter can be an essential tool in the field.
Meter technology has advanced significantly over the last 20 years. Modern multimeters are a perfect example, offering multiple functions for the day-to-day issues technicians encounter.
Today, we’re going to break down UEi’s extensive line of multimeters, discuss the pros and cons of each model, and explain some of their more specialized applications.
Specifically, we’ll focus on the UEi DL379B, UEi DL389B, UEi DL429B, UEi DL479, and UEi DM393. These are all excellent test instruments, but it can sometimes be difficult to determine which model is the right fit for the job.
Let’s take a closer look at these five multimeters and what each one has to offer.
UEi DL379B HVAC Clamp Meter
The UEi DL379B is one of the most popular and trusted meters used by contractors nationwide. It includes test leads, alligator clips, and a highly sought-after dual display that allows technicians to view amperage and other settings simultaneously.
It also includes a convenient lead holder attachment on the clamp, making it easier to test multiple areas with the red test lead. The functions included with this meter make it suitable for general HVAC contractors, appliance technicians, handymen, electricians, and other service professionals.
Pros
- Temperature settings available directly on the selector switch
- Built-in rear magnet
- Built-in work light
- Backlit display
- Detachable clamp head for narrow or difficult-to-reach conductors
- Two non-contact voltage detector lights
- High- and low-voltage detection
- Automatic power-off setting
Cons
- No True RMS functionality
- Non-contact voltage detection is limited to 600V AC
- Requires AAA batteries
UEi DL389B Dual Display HVAC Clamp Meter
The UEi DL389B is very similar to the UEi DL379B, but one of the major differences is the addition of True RMS technology.
The DL379B works well for most linear electrical loads, while the DL389B can accurately measure nonlinear and imperfect waveforms. This makes it useful for advanced HVAC technicians troubleshooting newer HVAC equipment, variable-speed systems, and computerized control boards.
Pros
- Accurate nonlinear-load readings with True RMS technology
- Live-wire quick-check function
- Diode testing for component failures and circuit continuity
- Fahrenheit and Celsius temperature settings
- Two-year limited warranty
- Higher voltage limit than the UEi DL379B
Cons
- More expensive than some comparable multimeters
- Designed primarily for professional use rather than homeowners
UEi DL429B True RMS Advanced HVAC Clamp Meter with Wireless Differential Temperature
One of the biggest reasons to choose a UEi 400-series clamp meter is its wireless connectivity. The UEi DL429B allows technicians to connect the meter to a mobile device and view readings without looking directly at the multimeter’s display.
This feature is especially helpful when the meter must be positioned in a tight, dark, or obstructed space outside the technician’s direct line of sight. The meter connects through a free mobile application and can be particularly useful for technicians who regularly service mini-split systems.
Pros
- Includes two temperature probes
- Wireless mobile-device connectivity
- Rated up to 600V CAT III
- Differential temperature measurement
- Compatible with a wide range of Fieldpiece-style accessory heads
Cons
- Uses buttons instead of a rotary selector for changing settings
- Display could be larger
UEi DL479 AC 600A True RMS HVAC Clamp Meter
The UEi DL479 is a strong, affordable option for technicians who are beginning their careers in HVAC. Among UEi’s True RMS multimeters, it is one of the more budget-friendly models available.
One feature that helps it stand out is its 1000V CAT III and 600V CAT IV ratings. This provides a useful operating range for light commercial and residential work. The meter also includes a flashlight at the top of the device that can operate alongside the backlit display.
Pros
- Backlit display
- Optional manual-ranging mode
- Sleek design with large rubber side grips
- Built-in True RMS functionality
- Non-contact voltage detection
- Data-hold function
Cons
- Not recommended for large-scale commercial applications
UEi DM393 True RMS Multimeter with Temperature and Capacitance
The UEi DM393 stands apart from the clamp meters in this comparison because of its accuracy in high-voltage measurement scenarios.
This CAT III 1000V meter includes a built-in temperature function and True RMS technology. Its simpler design helps keep the price lower while still providing an impressive range of measurement capabilities.
The meter can measure capacitance from 40.00 nF to 100 µF. For technicians looking for a straightforward multimeter that prioritizes accuracy during high-voltage testing, the DM393 is a strong option.
Pros
- 1000V AC measurement range
- 1000V DC measurement range
- True RMS technology
- Built-in temperature measurement
- Easy access to the battery and fuses without breaking calibration seals
Cons
- Does not include an HVAC clamp meter
- Smaller four-digit display
There you have it—we’ve broken down five excellent UEi multimeters, all available from Jackson Systems. Together, these models provide useful options for technicians at every level of the HVAC and refrigeration industries.
Not all meters are built the same, so it is important to understand the differences before making a long-term purchase. A quality multimeter is a tool that can remain in your service bag for years.
Take the time to choose the right model before your next upgrade. Contact us with any questions about the products included in this comparison. We hope this guide helps you select the right meter for the job.
As always, thank you for reading.
