Isotech Gemini 4857 dry block calibrators have a high capacity allowing a large number of probes to be calibrated together. They are also suitable to accept large diameter probes with the block volume of a nominal 64 x 160mm.These award winning calibrators are easy to use and are available in three versions: the Basic, the Site and the Advanced. The Basic has a digital display of set and nominal temperature, the Site additionally includes a built-in independent temperature indicator for a reference probe. The Advanced controller has inputs for reference and test thermometers with a further range of sophisticated features including automatic temperature cycling, secure data logging and full color high resolution display.