2023 UPGRADED DESIGN: Our battery voltage meter adopts a wider test range design, measured voltage range: 4 V- 100 V DC voltage. You will find this digital battery monitor is ideal for 12v 24v 36v 48v 60v 72v 84v and more batteries! REAL-TIME TEST: This battery monitor can measure and display voltage data in real-time, allowing you timely grasp the state of battery voltage between fully charged and discharged of this dc voltmeter. ACCURATE: Accuracy is 0.1V, providing an accurate reading to avoid car battery damage. Digital voltmeter display- precise 3-bit LED digital display, this voltmeter gauge in blue led display is very easy to read. EASY TO INSTALL: Plug and play. Easy to install and use, screws and insulated terminals are included, just use a screwdriver (not included) to install. Power Source Battery Powered Color Blue Measurement Type Voltmeter NOTE: When the measured voltage is larger than 120V, the voltmeter will be damaged.