gilbeada

Hi, I have the task of extending an alarm system to cover a small external cupboard and am after some advice with regards to the type of sensor to use. The cupboard is 3ft wide x 4ft deep x 4ft tall... not huge... it has one of those tubular 45w heaters installed that is nearly permanently on over winter. The cupboard is secured by a heavy duty wooden door and what looks to be a fairly decent lock. The cupboard houses about