Multifunctional mini digital tester signal indicator for measuring alternating current, voltage, and frequency simultaneously. Wide measuring range: AC 0-100A, 60-500V, and 20-75Hz. High brightness, easy-to-read 3-digit LED display provides clear readings. Compact 2.2 x 2.2 inch square panel with cylindrical main body design. Suitable for signal indication, alarm signals, and accident signals in electric power, telecommunications, machine tools, ships, textile, printing, and mining machinery. Specifications: Color: Blue, Green, Red, White, Yellow (optional) Material: Electrical components Voltage: AC 60-500V Current: AC 0-100A Frequency: 20-75Hz Item Size: 55 x 31 x 31mm (2.17 x 1.22 x 1.22 inches) Item Weight: 39g (1.38 oz) Package Weight: 44g (1.57 oz) Package Size: 7 x 3.5 x 3.5cm (2.76 x 1.38 x 1.38 inches) Packing List: 1 x Digital Meter