Features. Blowing Fuses- Plug in the FUSE BUDDY and read the circuit amperage draw. FUSE BUDDY can test the circuit amperage draw up to 20 amps. Original fuse is replaced in-line during testing, thereby maintaining circuit protection. Easy connection into ATD Blade fuse socket, FUSE BUDDY end is shaped like a fuse. Great tool for electrical troubleshooting at the fuse box. Can be used on all circuits up to 20 amps. Can even be used to test parasitic drains ( battery drains). Test range: 0 - 20 Amps - 48V DC -.01A resolution. Case Quantity - 1.