I can't necessarily test it's accuracy but it does seem to be reasonably accurate in terms of temperature and humidity just from comparing to what the temperature and humidity feels like. Very easy to read and is super easy to switch between °C and °F with a button on the rear for this function. There's a magnet for if you want to mount this on a fridge and there's a kickstand for if you want to put it on a desk.
The only thing that an upgraded model would benefit from is a backlight which could be switched on or off (or even make use of a light sensor). However, this would obviously impact on the impressive battery life of this unit.