Review on Tempil 28019 Surface Temperature Indicator, 1 Indicatometer, 250°F by Michael Hughes

I bought a pair of these and they are totally useless. The idea is to wipe them on something you're going to heat so you can see when it melts. Well, there is no such thing as a "swipe". These substances are rock hard, and no matter how hard you rub them into the object to be heated, none of it, except maybe a speck of dust, will slide off the object to be heated. I had to stick with the liquid color. Either this design is awful, or all the ones I've received have dried up. Also, the rod sleeve was frozen to the metal tube holding the rod and was quite difficult to remove. When I finally took it off, I saw that the stick inside was also broken into several pieces. Useless junk and he'll come back.