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Measurement voltage: 5V-38V, Input voltage: 12V-24V,used to monitor the battery voltage, with reverse polarity protection function, the line will not burn. LED digital display: real-time monitoring and display of battery voltage status, soft LED ambient light for easy use at night. Flame retardant material: made of high-quality materials of environmentally friendly anti-flame retardant PC, exquisite and compact design, strong and durable. Easy to install: Mounted in a 1-1/8" hole in the panel, it is easy to carry and easy to install, ideal for monitoring battery voltage. Wide application: Suitable for 12V-24V equipment, cars, motorcycles, boats, yachts, RVs, station wagons, trailers, vans, etc., it is recommended not to use voltmeters in 24V cars such as trucks/lawn mowers.