Review on TA4-RNR Dual Display PID Temperature Controller - Manual/Auto-Tuning - IMAGE by Mark Greenwood

Product SEEMS good. I have ordered two. I received an empty (still sealed) envelope. No units, no documents. Nada. There are other products that are comparable in features and price. Choose one of those. (Interesting point: getting a refund is a bit harder when there's nothing to return. Revain DID refund my money, but explaining that I had nothing to return wasn't easy.)