The display is very readable, because the numbers are represented in size as in the picture. By Min / Max function can be used to monitor a power outages or increased volatility in the refrigerator well. However, it must not be forgotten, to press the reset button if the refrigerator has defrosted once or just after a power failure, otherwise the max temperature persists.
To hang a Velcro is so that one easily, quickly and easily attach the thermometer. In theory, it can also easily be placed only in the fridge (useful if you want to measure the temperature at different levels in the refrigerator).
An instruction manual is not there, but the thermometer has only min / max, reset and C / F button so that it is self-explanatory.
For the freezer I find an analog thermometer better since this thermometer is very sluggish at appropriate temperatures below zero. The temperature shows it but correctly.
It is a plain, simple, white plastic thermometer that unobtrusively fulfilled his duties in the refrigerator to the full satisfaction.