Matco Tools' FF310 Circuit Testing Kit, includes: Short/Open Circuit Finder with noncontact technology (operates on DC voltages from 6 to 36 volt); CT80 Professional High-impedance circuit tester (computer and air bag safe). Operates on DC voltages from 3 to 28 volt.; CT6100 Fuse Socket Connector Setfits all mini, ATO and maxi size automotive fuse blocks; and rugged case.