The Mackie MTest-1 is a cable tester designed to provide pin-to-pin troubleshooting of multiple connection types for musicians, stage crews, and audio engineers in live stage applications and home, project, and mobile-recording studios. It features XLR 3-pin, speakON, RCA/phono, MIDI, banana/continuity, 3.5mm TRS, and 1/4" TRS/TS jacks and includes probes for testing other connectors and bare wire. Its 6-way switch offers a straightforward way to check battery status and the continuity of each pin. The MTest-1 is sturdily constructed with heavy-gauge steel for dependable use on tour or in the studio. Being powered by a single 9V battery, it requires no additional power supply.