5-piece AC 12-500V voltmeter, voltmeter power monitor LED indicator Description. It is a digital multimeter voltage signal indicator with High brightness LED display and cylindrical body. AC. It can be used as an indication marker on power lines, telecommunication, mechanical machinery, ships, textile, printing indication signs, warning signs, accident signs and other signs on mining machinery. Size: approx. 28.5*51.4mm Colour:Yellow, Red, Blue, Green, White Package includes: 5 voltmeters Caution. Due to manual measurement, please allow 1-3mm of measurement deviation. Due to different effects and lighting effects, the actual colour of the item may differ slightly from the colour shown in the picture.