I have been searching for an optical style (probably IR) temperature sensor that can measure up to 3000 °F that doesn't cost hundreds of dollars and can be interfaced to an AVR for automation. (accuracy does not need to be super tight, +-10 °F would suffice. So far I have found many of the "gun" style ones that claim to read above 3500 °F and they go for around $100! The only problem is this kind would need to be "hacked" in order to interface to an AVR, and I would much rather find a product intended for such use. Does anybody know if there's a sensor like this for say, under $300? I'm stumped.