I have 1 zoo-med pro series 500r remote sensor thermostat and 1 zoo-med 50-60gallon (large) U.T.H. for sale. Both have been opened and never used (only checked to be functional). If you plan on purchasing these items go no further because my prices are lower than shopping online. They were purchased online from vendors that return policy includes only unopened product. If you are interested simply click on my signature link and click miscellaneous in the categories menu. Happy herping