Digital Round Display Two-Wire DC Voltmeter 4-100V

From the shop's description

Features: Use: It works for DC 4-100V, mini size and easy to install, work great for checking voltage. Large display: 3-digit LED digital tube, large numbers, quickly and easily read. Opening hole: The opening hole diameter is 3cm, easy to install. Reverse connect protection: It can be protective when connect the wire inversely or wrong. Compact design: It is compact, mini size and portable, easy to store and carry. Good quality: It is made from good quality plastic, which is durable, long lasting. Specifications: Display color: Green/Red/Blue Shell color: Black Wire length (Approx.): 10cm Material: plastic Voltage: 4-100V Opening hole size: diameter 3cm Minimum start: 3.8V Permissible error: ±1% Input impedance: 100K ohms Working current: red 15mA, green 12mA, blue 12mA Refresh rate: approx.. 300mS/time Display: 3-digit round LED digital tube Operating temperature: -10℃∼65℃