This is a photo of my Kinsa – bought it in March ’cause I got tired of never having a working thermometer  No batteries; plug it into your phone and it keeps a log of temperature readings.
By using your smartphone, Kinsa takes advantage of 25,000X the processing power of a regular digital thermometer – virtually no electronics inside and no batteries required – so the thermometer is extremely lightweight and durable for carrying  and always ready to use.  Now pay only $14.99 with free shipping – that’s an extra $5 off.

Was super easy to set up – it talks you through!