As a vendor of automatic temperature monitoring systems we provide glycerine bottles with 33% water. That proportion has the lowest freezing point (under -45 F and C). Glycerin is only used to lower the solution's freezing point. Worth noting that pure glycerin is a gel solid way above freezing. The solution is a worthwhile simulation and yes, it does seem to average (integrates) the temperature so you dont see the door opening for short moments nor the defrost cycles as prominently as you would with an air probe. We provide the glycerin solution gladly and without hesitation. However for you to get the best of both worlds, our portal (Freshloc's that is) takes a standard air probe measurement and creates another seemingly live sensor that behaves just as if you had any amount of solution the probe was in. Then you get to see the "way it is" and as if it was in the glycerin. Alerts and all reporting can be based on either the real probe or the simulated probe. Anyone can graph any time, the actual data and the integrated data as well, whether they set up this added simulated probe or not. In summary, the fast response probe simply alerts too quickly for some so the glycerin or simulation eliminates (or reduces) the number of alerts due to just a door opening for a minute or so. Rik