Zico Zi-1020 20 Amp Fuse ATC Current Tester - Mini Fuse Standard Can test circuit current up to 20 amperes - an easy way to check fuel pump amperage Clever design allows for easy connection into fuse sockets ATC Fuse Tester ends are molded into the shape of the fuse itself During testing the fuse is removed and replaced into the ATC Fuse Tester; this way the circuit being tested maintains fuse protection ATC Fuse Tester stays put and will not fall out of the socket like test probes do