With this listing you will receive one temperature strip.  It shows temperatures from 37C to 70C.  This gives the best range of temperature readings for milk throthing for use in Coffee drinks.

These have a high accuracy and are of good quantity.  They adhere well and should last well on the outside of a milk jug/pitcher.  I would however advise to wipe over with a sponge to clean and not an abrasive, to prolong lifespan of the strips.  Handwashing would also be preferable to using a dishwasher for the same reason.