So how much of a floating thermometer is supposed to stick out of the wort? I bought one today from the LHBS along with some iodophor so I'd have everything I need to brew my first batch...and how fitting on Home Brew Day. So I clean everything and start heating the water for the steeping grains. The turkey fryer I borrowed from my father-in-law has a thermometer so I was using it and the floating jimmy I picked up today and they were reading about 10 degrees apart. So I decided to rely on the floating one.
Only problem was I couldn't read the temperature without pulling it out of the water. So I'm using my tongs to grab it and check temp so I can dial in 155 degrees. I'm getting close so in goes the steeping grains. I go to check the temp again and the damn thing slips out of the tongs, hits the side of the kettle and POPS. Summumabit@$%. Broken glass and whatever the thermometer is filled with is now in the steeping water. Brew day over.