Downloads Brochure for portable shown above Summary Available in a variety of sizes, the Darwin MC Series Material Test/Cure Chambers are ideal for the rigors of precision temperature and humidity control in concrete, asphalt, and related industries. Unlike the vast majority of "testing" apparatus available to control temperature / humidity for engineering demands, these chambers provide reliable operation, durable construction and accurate results. The MC Series offers serious performance to engineers and researchers looking for serious results. To set the MC Series apart from typical “environmental chambers” or “home built units,” we have incorporated a number of features to produce the best chamber to meet ASTM, ACI, AASHTO, CCRL (The Cement and Concrete Reference Laboratory, a division of ASTM International), and other standards. Some ASTM standards we conform to are C309-06, C156-05, C511-13, C666, C31, C192.