Charlie wrote:The picture is becoming clearer.
The $50.00 EW-93520-12 On/Off and Limit Switch Temperature at Cole Parmer is the same as the TSX-10140 Digital Temperature Switch at Dwyer ($55.00).
The $55.00 EW-93520-00 On/Off Temperature Controller at Cole Parmer is the same as the TS-13010 Digital Temperature Switch at Dwyer ($65.00).
I freaked out because I went to the Dwyer site to buy one and found the TCS-4010 Thermocouple Temperature Switch for $70 and thought the prices had gone up!
I wish I knew what the real difference in these controllers is. I'm about to say to hell with it and buy another Ranco.
Charlie
93520-12 uses a thermistor for reading temperature, the 93520-01 (could not find -00, was this a typo?) uses a thermocouple. Other than this, they control temperature identically. I have had good luck with the thermistor model (93520-12), but in general thermistors are prone to "drift" over time, like the cheap digital thermometers. Thermocouples are generally more stable over time and have a broader temperature range available, especially at the high end (1350°C). For homebrewing, the thermistor controller is just fine for our purposes, although both will work.