MASTECH is a premier manufacturer of electronic test and measurement instruments, including digital multimeters, clamp meters, and infrared thermometers.
MASTECH is a globally recognized brand in the test and measurement industry, known for producing high-quality electronic measuring instruments for over three decades. Operating under the MGL International Group, MASTECH manufactures a wide array of tools essential for electricians, technicians, and DIY enthusiasts. Their extensive product catalog includes digital multimeters (DMMs), clamp meters, voltage testers, infrared thermometers, power supplies, and environmental testers such as sound level meters and anemometers.
Combining precision with durability, MASTECH focuses on safety and innovation, ensuring their products meet rigorous international standards like CE, ETL, and RoHS. With a strong presence in North America, Europe, and Asia, the brand provides accessible professional-grade tools backed by a global support network. Whether for industrial troubleshooting, automotive diagnostics, or home electronic repairs, MASTECH instruments are designed to deliver accurate data and reliable performance.
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'OL' stands for Over Load. It indicates that the value being measured exceeds the maximum limit of the currently selected range. Switch the dial to a higher range to obtain a reading.
Turn off the meter and disconnect test leads. Remove the back cover screws to access the interior. Replace the blown fuse with one of the exact same amperage ug voltage rating as specified in your user manual.
Support for North America is provided by MGL America, Inc. You can reach them at +1 833-533-5899 or via email at cs.na@mgl-intl.com.
Check if the batteries are depleted or installed incorrectly. Many MASTECH models also have an auto-power-off feature; try pressing a button or turning the dial to restart it.
You can download manuals from the official MASTECH website support page or browse our comprehensive collection here on Manuals.plus.