Ultra-small 0-100V DC 3-Wire Voltmeter 3-Digit LED Volt Meter Voltage Tester

Monitor DC voltage between 0V and 100V with this simple 3-wire voltmeter
Use a separate 4-40V DC power supply allowing voltage readings down to 0V and up to 100V or use it as a 2-wire voltmeter for 4-40V.
Working current: <20mA • Refresh rate: 200ms • Auto ranging 0.01V precision • Reverse polarity protection
Size: 23x11.7x9.2mm (30mm wide including posts) • Wire Length: 15cm
Operating Temp: -10℃ - 65℃ • DC only, not for use with AC • Supply voltage above 40V will damage the unit