3pcs Blue 0.36 Inch DC 0-30V 3 Wire LED Volt Meterr Digital Display Panel Volt Meterr

Feature: The black line connected to the public negative electrode, red line connected to positive pole of power supply, yellow line connected to positive pole of tested power supply Material: Plastic Shell Display Digit: 3 Measuring Range: DC 0-30V Working voltage: 4-30V Display Size: Approx 2.3cm x 1.2cm / 0.91" x 0.47" Overall Dimension: Approx 3.4cm x 2.2cm x 2cm / 1.34" x 0.87" x 0.79" (L x W x H) Cable Length: Approx 20cm / 7.87" Package Included: 3 x Blue Digital LED Display Voltmeter