Digital ammeter & voltmeter DC 4.5-30V & 50A with 50A shunt Red&Blue Led Dual Panel Volt Amp Combo Meter

DC 4.5-30V 50A Red&Blue Led Dual Panel Volt Amp Combo Meter with 50A shunt 

Display Type 0.28" Red + BLUE LED
Display DC voltage(Red LED display) and DC current(Blue LED display) automatically,can be clear at a glance.
Is widely used in equipment and electromechanical device.Cars, boat, planes etc. for measuring current, voltage.
Monitoring PC & electrical system.
It's small size and easy installation

Display Range: DC 4.5-30V/0-50A (Please don't exceed the range)

Measure voltage let the meter work  so Measure voltage  need at least 4.5V