I bought this thermometer over 5 YEARS ago when I was studying to be a vet, and have used it all day, every working day since before and after I qualified, without changing the battery once.
It finally gave up the ghost last week and I am going to buy another one as I was most impressed. It has been extremely reliable depsite being in carried round in my tunic pocket, getting dropped, immersed in ??? and generally abused. It gives a very fast and (presumably) accurate reading, and the bendy tip helps with comfort for the animals.
I thouroughly reccomend this product for its toughness, reliability and speed.