Liquid crystal voltmeter  D85-20 , D69-20, D91-20 series is a small volume of economical digital electrical measuring instrument, mainly used for real-time measurement of AC voltage, DC voltage or AC current, DC current in the electrical circuit, and with LED digital tube or LCD liquid crystal in digital direct reading mode. It is widely used in substation automation, distribution automation, testing equipment, generators, and so on. The product has the advantages of high precision, high stability, high reliability, low power consumption, small size, easy installation, and LCD has the advantages of clear backlight display, etc., which is an ideal product to replace various pointer electric measuring meters.