I finally caved and bought a thermal camera for diagnosing fridge issues. Wish I'd done it years ago.
For the longest time I thought those things were overkill for a basic repair guy like me. But a few months back I had this Walker unit in a deli that was cooling fine on the display but cycling too often. Spent two hours chasing my tail, checking pressures, cleaning coils. Buddy of mine stopped by with his little FLIR, pointed it at the evap, and spotted a patch of ice near the back in 10 seconds. Evap fan was dying. Ordered one that week. Cost me about $250. Anyone else have a tool they were dead wrong about?