DROKxae; DC Port Volt Amp Power Meter Voltage/Current Tester Monitor LCD Display Measure range: DC 3-20V,0-2A DC plug: 1,Outside diameter:4.8 mm; Inside diameter:1.7 mm 2,Outside diameter:4.8 mm; Inside diameter:1.7 mm 3,Outside diameter:5.5 mm; Inside diameter:2.5 mm 4,Outside diameter:5.5 mm; Inside diameter:2.1 mm