Specifications include, but are not limited to: Test Plates: a. The DSR upper test plates must have a zero-heat flow thermal insulator integrated into the upper plate shaft to prevent drift in temperature calibration due to changes in room temperature. b. The DSR upper and lower test plates shall be serialized via permanently machined etching and be delivered with documentation of precise plate diameters as required by AASHTO T 315 and ASTM D7175 reporting requirements for test plate diameter. One set of 4mm, 8mm and 25mm upper and lower test plates shall be provided. Environmental Chamber: a. The DSR Environmental Chamber shall affect temperature control using a lower plate chamber with integrated Peltier elements for control over the temperature range of -40° to +200°C and upper hood with integrated Peltier elements for control to permit testing over the temperature range of -30°C to +120°C. Active cooling of the upper test must be integrated in a hood or other enclosure. Cooling via conduction from the lower test plate will not be accepted. Systems providing temperature control of the upper test plate via electrical resistance heating, fluid circulator cooling, vortex chiller cooling, or LN2 cooling will not be considered. One Peltier controlled lower plate and one Peltier controlled upper hood enclosure shall be provided. b. The DSR Environmental Chamber shall include an upper hood with integrated Peltier elements with a hold and heat position such that the DSR measuring drive with upper test plate affixed can be raised at least 75mm from the lower plate and the hood be in place around the upper test plate to maintain upper test plate temperature during lower plate cleaning and periods of disuse