Hi Pluto, We use 2 bag thermogenesis thawers and have never mapped these. Our validation plan/ data was reviewed by the inspectors and no comments were made, though we had stated in the validation that there was no purpose in doing this. The water circulates and the temperature is monitored by in-built calibrated equipment and over-temp alarms in place. It may be useful to map much larger thawers (e.g 10 bag ones), but this would be to check that water circulation was adequate in all areas. If you are using a dry air thawer this may require mapping, but only because some of these thawers have rapid thaw programs that brings the internal temp to around 50'C (though these are not meant to affect the internal component temp- but I suppose these could be open to abuse). Regarding daily recording of Diamed incubators-we stopped daily recording of these as there seemed little purpose in taking a one point temperature. If your SOPs state that it is procedural to place your cards into the incubator, with the appropriate serological controls, when it is at the required temp- I personally think this is sufficient.