Review on TPI ET9S4TS Voltage Terminal 35° 75°F by Tom Roberts

Temperature deviated by 15 degrees; it closed at 50 degrees when set at 35 and at 65 when set at 50. The calibration set screw was sealed with some kind of epoxy so I couldn't calibrate it. I was eventually able to remove it using a Dremel tool and solvent, which took about an hour. Then I could calibrate. But I would never buy this again because it was really a hassle to fix and get it working.