Multifunctional mini digital tester signal indicator, which can simultaneously measure AC current, voltage and frequency. Wide measuring range of AC0-100A, 60-500V and 20-75Hz. The easy-to-read 3-digit LED display with high brightness provides a clear reading. 2.2 x 2.2 inch square panel with cylindrical main body. It can be used as a signal indicator, alarm signal and accident signal in electricity, telecommunications, machine tools, ship, textile, printing and mining machinery. Features: Multifunctional mini digital tester signal indicator, which can simultaneously measure AC, voltage and frequency. Large measuring range of AC0-100A, 60-500V and 20-75Hz. The easy-to-read 3-digit LED display with high brightness provides clear reading. 2.2 x 2.2 inch square panel with cylindrical main body. It can be used as a signal indicator, alarm signal and accident signal in electricity, telecommunications, machine tools, ship, textile, printing and mining machinery. Specifications: Color: blue/green/red/white/yellow (optional) Material: electrical components Voltage: AC 60-500 V. Current: AC0-100A. Frequency: 20-75Hz. Item size: 55 x 31 x 31 mm / 2.17 x 1.22 x 1.22 inches. Item weight: 39 g / 1.38 oz. Package weight: 44 g / 1.57 oz. Package size: 7 x 3.5 x 3.5 cm / 2.76 x 1.38 x 1.38 inches. Box contents: 1 x digital meter