NUXNMT-1 4-in-1 Rechargeable Compact Multi-Tester with Large and Intuitive Display, Featuring Patch Cable Tester, DC Cable Tester, Pedal Current, Voltage Meter, and Tuner Functions

First off, the tuner is insane. It's shockingly accurate, and locks in faster than my BOSS TU-3. That alone is worth the price. I'm rebuilding my pedalboard with George L's, and this gizmo made checking the connections a breeze. No more sweating if the cables are connected correctly, or the headache of having a faulty one, and going through each cable piece by piece. Especially if you are running the cables underneath your board for a clean look. Knowing your pedals draw, or any faulty power cables is another great feature. I'm leaving it on my pedalboard full time for the tuner. Get one, you won't regret it