The IRXL220 does not contain a "temperature guide on sheath" as it states in the Product Description. Otherwise, it is as advertised and registered exactly 32 degrees when it sat in ice water for about 30 seconds. If you want the temperature guide on the sheath and don't care about the calibration tool, look at the model IRL220, but note that it goes from 60 to 220 degrees, not from 0 to 220 degrees like the IRXL220.