Cable testers, diagnostic plugs and pro-grade batteries for the checks that stop a show going wrong. Palmer’s MCT XLV 2 covers most connectors a production loom can carry: 3-pin and 5-pin XLR, 4-pole and 8-pole speaker connectors, 6.35mm and 3.5mm jacks, RCA, DIN and MIDI, USB and RJ45, tested automatically or pin by pin, with probes for tracing installed wiring. The MCT DMX concentrates on 3-pin and 5-pin DMX continuity with LED rows showing the state of every pin at both cable ends, and its 3-pin sockets double up for standard XLR microphone leads. Both live in powder-coated steel housings and run on AA cells, and the DMX unit ships with L-brackets so it can be fixed to the workshop wall where looms get packed.

On the power side, the PCE 32A 415V diagnostic plug connects to a five-pin ceeform outlet and shows on LEDs whether each phase is present, which way the rotation runs, and whether neutral and earth check out, all before any distro or racks go near the supply. Duracell Procell cells keep radio mics, belt packs and the testers themselves running; buy by the box and rotate stock by date.

A tester earns its keep in prep, not on site. Testing every loom as it gets packed means faults are repaired at the bench instead of hunted down during line check. Most faults start in the audio, power and data cable categories nearby, which is exactly why this shelf exists.