Review on Tempil 28019 Surface Temperature Indicator, 1 Indicatometer, 250°F by Rodney Gonzalez

I bought this temporary pin to use in soldering. Like so many others, this makeshift pen is complete junk. It just crashes when you try to use it. You can heat the steel until it's cherry red and the thing still won't melt (it'll just crumble and fall apart). To top it off, I left the temporary pin at the store overnight and when I came back the next morning to find it bulging and falling to pieces. I'm sending this back.