The Model D4004 Chiller provides controlled sample cooling for a Model 75 Viscometer. The chiller is capable of regulated sample cooling; from ambient temperature to -10°C. The amount of time required to cool a 200 Centipoise silicone calibration fluid from room temperature to -7°C is less than 30 minutes (with sample stirred at 40 RPM). The Digital Controller allows temperature regulation of +/- 0.1°C. Sample temperature is indicated on the display screen of the Model 75 Viscometer and within the normal display screen of the host computer.