So I decided to go back to all grain this weekend. I heated my strike water to warm my MLT and I was waiting for it to cool. Then I thought I better check my thermometer with another. It was off. I grabbed another and it was different still. I no have four themoms in the water and I am trying to figure the best way to make sure my strike water is 164. With all of the thermoms (one electric and three dial) I am getting a range in temps from 175 to 137. How can I make sure the water is the right temp?