Your Kinsa QuickCare thermometer will work with any universal or generic digital thermometer probe tip cover.
We recommend looking for them at your local pharmacy or supermarket, and avoiding any specialized probe tip covers designed for specific models of thermometers. Consider bringing your thermometer along with you, and consulting with a pharmacist or other employee for any questions about what they have for sale.
It’s worth noting that many of our customers don’t use probe tip covers with their QuickCare thermometers. You can safely clean the tail end with a tiny amount of warm water and soap, or 60% isopropyl alcohol with something sterile to wipe it with. Don’t boil your Kinsa, run it through the dishwasher, or submerge it in any liquid. Doing so could damage the internal hardware since the thermometer is not waterproof.