Brookfield TC-550SD-115 Circulating 7L Water Bath with Programmable Controller Circulating, Refrigerated Water Bath. Temperature Bath Systems combine state-the-of-the-art controller displays with high performance circulating baths to give accurate viscosity test results. The TC-550 measures directly in the bath and operates in standalone mode. The TC-550SD Series Model offers the best value: programmable with PC control using Rheocalc Software, 2 speed pump, quick scroll to set temperature in standalone mode, and maximum temperature up to 170C. Main Benefits Provides standalone operation - no tap water required Easy control of set-point Configured to measure viscosity directly in the bath - accommodates 600 mL beaker Programmable Controller version is designed to automate sample temperature control Built-in circulator pumps to external devices Please be aware that this unit powers on, but it has not undergone professional testing. Therefore, it is being sold AS IS, without any guarantees or warranties.