The thermometer sheath tears when I insert the thermometer and peel away the protective top covers. What am I doing wrong?

It is important to fully insert the thermometer into the sheath such that the thermometer’s probe TIP is within roughly 1mm of the sheath end. If too large a gap is left the sheath will fold over the tip which may result in puncture. Make sure the top cover is removed first, then the bottom cover. On flexible tip thermometers it is helpful to hold the thermometer a bit closer to the probe end to minimize flex when peeling off the top and bottom paper covers. Click on the attached link to view a video demonstrating the proper technique.

Video demonstration