The problem with a hot plate, is when it needs heat it gives full power, it stays at full power until the tstat tells it to shut off, Same with a presto pot. The hot plate has far more element so even when it shuts off its still heating till the element cools, causes over temp. I haven't measured a hot plate, but on the mechanical temp controller on a presto, you will easily spike 40 degrees. I have setup prestos on electronic controllers and can maintain a 2 degree variance, as the load decreases the temp will rise. But 2 degrees with same load at idle.. I am currently working on a double 1quart stainless steel pot setup. I quart, each pot, One controller for identical temps, It will have built in injector holders, and be capable of using a twin, There will be no stirrers yet, this is gonna be designed to be cost effective for guys who shoot a lot of laminates, and or like having two hot colors for tails etc.