Product details:

Model No.: FLS-EC004 

.3-digital voltage display (Red/Blue/Orange)

.Black wire mesh cover                                        

.Electronic polarity protection circuit,automatically alarms When the 
polarity is reversed and the voltmeter will display low voltage

.Over-voltage protection circuit                                                           

.Working temperature:-40 to 105 degrees centigrade                                 

.Mounting brackets&hardware included
.Extreme Low E.S.R.:less than 0.0015ohm
.Size:76×220mm
.Working Voltage:10V-20V 
.Surge Voltage:24V
.Max Capacity:5.0F