This is a home made magenetic nano. You need to bring you own pen. Its ideal if you have to wait for the bus and are bored. The magnet used is a simple and weak fridge magnet, so please make sure it sticks propperly when you place it. At times there can be many muggles in this spot, so I'd recommend to rectrieve the cache discretely and then walk on the footpath around the corner to sign the log in private.
Fvg qbja.