1、Using voltage, current and frequency three indicators, the three-in-one design is more scientific and reasonable 2、Five rich colors, red, green, yellow, blue and white can be chosen at will to meet your different needs 3、Using ABS high-quality materials, durable, safer and more reliable, and the product has long service life 4、The appearance is smooth and beautiful, and the classic square design is more convenient and quick to use 5、The wiring is accurate and meets the standard, the coil quality is high, the safety performance is good to effectively prevent electric shock Item Type:  Digital Led Indicator Lamp Material: ABS Model: ST17VAH Shape: Square Current Pressure Measurement Range: AC0-100A Supply Voltage Range: AC60-500V Frequency Measurement Range: 0-99Hz Display: Voltage, Current, Frequency Installation Aperture: Approx.22mm / 0.9in 1 x Indicator Light 1 x Current Coil Transformer