?This is a very practical mini voltmeter£¬ portable£¬ water-proof£¬dust-resistant and shock-proof. It has 3 wires to connect and has reverse polarity protection. Clearly display the testing results in the LED screen and can be widely used in automobile£¬ motorcycle and other rgged environment. You should own it to make your work easier.<br><br><strong>Features:</strong><br>Adopts fully-closed shell and encapsulated design£¬ water-proof£¬ dust-resistant and shock-proof.?<br>0.31" LED digital tube and 4 digits for display£¬ 0-33.00V measuring range.<br>3 wires for easy connection£¬ with reverse polarity protection.<br>Widely used in battery voltage detection of automobile£¬ motorcycle£¬ electrombile and other applications.<br><br><strong>Specifications:</strong><br>Display Color: Red LED<br>Digital Tube: 0.31" 4-digit<br>Supply Voltage: 3.5-24V<br>Measuring Range: 0.00-33.00V<br>Accuracy: 0.3%(+/-)2dgt<br>Wiring Length: 11cm / 4.33in<br>Working Temperature: -10¡øC-65¡øC<br>Working Humidity: 10-80% (NO Condensation)<br>Working Air Pressure: 80-106kPa<br>Item Size: 47 * 20 * 1.5mm / 1.85 * 0.8 * 0.6in (L * W * H)<br>Item Weight: 14g / 0.52oz<br><br><strong>Note:</strong><br>Red Wire: positive pole of power supply£¬ connect the positive pole in the range of DC 3.5-24V.<br>Black Wire: public negative pole£¬ it's positive pole of power supply and also referent negative pole of measurement.<br>Yellow Wire: measuring signal input positive pole£¬ 0.00-33.00V.<br><br><strong>Package List:</strong><br>1 * Water-proof Voltmeter