Hi guys, I'm new to this forum and first of all would like to say Hello to all of you. I'm an R&D Engineer ( not long since I've graduated ) and I share a great interest in engineering therefore will be following the forum at regular basis. Today I write to you with a problem I need to solve. I need to test a relatively small item (2m length by 1m width by 1m height) however the testing needs to be done at different temperatures. The first one would be roughly -50deg C, second at ambient temperature and third at +220deg C. Now previously we have used heating fans for the heat test and liquid nitrogen for the freeze tests (all this wrapped up in a steel box with insulation). My question is: what would you recommend to improve my tests, I've looked into heating blankets and industrial refrigerators however is there a device that would do both? Are there heating/freezing blankets available or perhaps refrigerators that allow both positive and negative temperatures?