ALDI's latest offerings this last weekend included a Workzone Inspection Camera. Although I have another inspection camera I thought it was worth a look. The camera head is 5.5mm diameter and that includes the six LED's. My current camera head is 16.5mm dia so quite a difference.
It is a very good piece of kit, how they do it for £39.99 I do not know. Image can be colour or B&W, can be mirrored or turned up side down, magnified 1.5 or 2 times digitally, 5 stage LED brightness, picture brightness, Video output port, long flexible shaft, waterproof to 1 metre, complete with magnetic attachment, hook attachment and mirror attachment. Uses 4 AA batteries. So impressed I went back and bought 2 more for colleagues.
If you need to see into/access difficult places its well worth it.
No connection with ALDI, just satisfied.
Colin