I have a ten year old pocket thermometer like the chefs carry in their pockets like an ink pen. It is accurate but a small display with no backlight. I like all the features of this 'Daybetter' model except it is a bit bulky to carry in a pocket, its case is about 7/8th inch thick. It switches on by simply unfolding the probe to extend it. It uses the common large CR2032 coin cell that is reasonably priced and long lasting. Has a backlight button and it can be calibrated if needed so keep the little (actually tiny) instruction sheet. The size of the display is larger than most, so old eyes can see it clearly without bifocals.
TESTING - I have a hot water dispenser, the older thermometer and this, they all read digitally 160 degrees when immersed in the hot water dispenser's tank, within half a degree of each other.
When I'm checking something in the oven this longer thermometer with instant on and a backlight is going to be the most convenient and safest to use. Unless you need a waterproof thermometer, I highly recommend this one.