Features: 1. Wide Voltage Range – Works with DC 4.0V to 40V, and can measure voltages from 0V up to 100V. 2. Compact & Clear Display – Features a bright 0.28-inch LED screen that shows voltage readings clearly, even in low light. 3. Easy Panel Installation – Designed for simple panel mounting with a 3-wire connection—no complicated setup needed. 4. Low Power Consumption – Energy-efficient operation, making it suitable for long-term use in various electronic projects. 5. Versatile Application – Ideal for DIY electronics, power supply testing, solar systems, car batteries, and other DC voltage monitoring needs. Product Details: This mini digital voltmeter offers accurate DC voltage detection from 0 to 100V, with a wide operating voltage range of 4.0–40V. Its compact 0.28-inch LED display ensures easy reading, while the simple 3-wire design allows quick panel mounting. Perfect for hobbyists, technicians, and everyday voltage checks in vehicles, solar setups, or electronic devices. Specifications: - Working Voltage: DC 4.0–40V - Detection Voltage: DC 0–100V - Working Current: Low consumption - Display Type: 0.28-inch LED - Connection: 3-wire - Mounting Style: Panel mount - Package Includes: 4 voltage testers