<p>Features:<br/>1. Use: It works for 4-100V, mini size and easy to install, work great for checking voltage.<br/>2. Large display: 3-digit LED digital tube, large numbers, quickly and easily read.<br/>3. Opening hole: The opening hole diameter is 30cm, easy to install.<br/>4. Reverse connect protection: It can be protective when connect the wire inversely or wrong.<br/>5. Compact design: It is compact, mini size and portable, easy to store and carry.<br/>6. Good quality: It is made from good quality plastic, which is , long lasting.<br/><br/>Specification:<br/>Display color: greenredblue<br/>Shell color: black<br/>Size: 3.38*3.38*1.8cm<br/>Wire length: 20cm<br/>Material: plastic<br/>Voltage: 4-100V<br/>Opening hole size: diameter 3cm<br/>Minimum start: 3.8V<br/>Permissible error: ±1%<br/>Input impedance: 100K ohms<br/>Working current: red 15mA, green 12mA, blue 12mA<br/>Refresh rate: approx.. 300mS/time<br/>Display: 3-digit round LED digital tube<br/>Operating temperature: -10℃65℃<br/><br/>Package includes:<br/>1 x LED voltmeter<br/><br/>Warm tips:<br/>The input voltage can not exceed 100V or the voltmeter will be damaged.<br/><br/>Notes:<br/>1. Please allowed 1-3mm differences due to manual measurement, thank you for your understanding!<br/>2. Due to the difference between different monitors, please understand that the picture may not reflect the actual color of the item.</p>