1、This is a digital voltage tester signal indicator. 2、High brightness LED display for easy reading. 3、The indicator can only be used to measure AC electricity. 4、Small size, simple structure, easy to install and use. 5、It can be used as signal indication, warning signal, accident signal and other signals in the electrical lines of machine tool, ship, textile, printing and mining machinery. Features: This is a digital voltage tester signal indicator. High brightness LED display for easy reading. The indicator can only be used to measure AC electricity. Small size, simple structure, easy to install and use. It can be used as signal indication, warning signal, accident signal and other signals in the electrical lines of machine tool, ship, textile, printing and mining machinery. Specification: Measuring Range: 60-500V Input Voltage: 60-500V Voltage Measuring Accuracy: +/- 2% Ambient Temperature: 0-50℃ Dimension: Approx. 50x28x20mm / 2x 1.1x 0.8in Weight: Approx. 23g Optional Color: White, Blue   Package List: 1 x  AC Voltage Signal IndicatorNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.