This is a square digital thermometer/hygrometer (In White), it comes complete with battery plus a spare battery.
It can be stuck to the enclosure with a double sided sticky pad which is included, or it can be secured in place with a long piece of blue tack along the top edge, and pushed firmly into either left or right front top corner of the enclosure.
Please note:
It is best to position the gauge at the top front corner of an enclosure for the most accurate reading.
The gauge measures 45mm square, and 12mm Deep.