Features: Made of high-quality materials for durability It is a digital voltage tester signal indicator, high brightness LED display and cylindrical body. This meter can only be used to measure alternating current. It is used as signal indication, alarm signal, accident signal and other signals in electric power, telecommunications, machine tools, ships, textiles, printing, mining machinery and other circuits. Display: voltage, current, frequency, three-in- display, small and exquisite, powerful. Specifications： Available colors: red, white, blue, green, yellow Installation size: 22mm/0.87" material: plastic Voltage measurement range: AC50-500V Current measurement range: 0-100A Frequency measurement range: 20-75Hz Size: 2.88*5cm/1.13*1.97" (D * H) Package list: 1 * Tester 1 * Transformer Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data. Made of high-quality materials for durability It is a digital voltage tester signal indicator, high brightness LED display and cylindrical body. This meter can only be used to measure alternating current. It is used as signal indication, alarm signal, accident signal and other signals in electric power, telecommunications, machine tools, ships, textiles, printing, mining machinery and other circuits. Display: voltage, current, frequency, three-in- display, small and exquisite, powerful.