This may help. http://www.auberins.com/index.php?main_page=index&cPath=1 Look at: SYL-1512A (Or any of the others, really...) If you want to lock a temp down and use a light bulb or similar, this is a pretty cheap way to go. I've used them for large soldering irons, reptile incubators, and temp chambers. They work great if you need to hold temp long to stabilize everything before a measurement. Very nice units for the price. I'm sure you know this, but watch your temp gradients in the chamber. Dan > As we all know, step #1 in making a clock is NOT > to build a thermometer:-) > > I thought I would check the brain trust here to see > if anyone has seen a hobbyist grade temperature > testing chamber or kit or homebrew design. I > have some crystals, oscillators, and other > electronics I would like to characterize over > temperature. I know this reflector has discussed > homebrew stabilization ovens; however, they > have tended to have very long time constants > (which makes sense for that application). I > need to be able to change temperature in a > reasonable amount of time, and I don't need > extreme stability. Looking for any ideas, > maybe in the "maker" spirit. I think the > size I need would be perhaps 1/2 the size > of a shoebox. > > BTW, in case someone has a chamber to sell, > let me know... > > Rick Karlquist N6RK