Have you calibrated your thermometer lately? What type of system do you have? Spray hot water on the strip or wipe down with a very hot drenched cloth and it will show the fill mark. As to the liquid crystal temperature sensing technology, this is used in the fish and amphibian pet industry. It has to be accurate or there would be some very upset pet owners.
Scott Zuhse, Instructor
Micro Matic Dispense Institute