looking at hazard signs and safety equipment for DIY badge
print off sheet with hazard signs and list of safety equipment
Bring in tool boxes, instruction leaflets, etc including hazard & personal safety equipment signs.
Bring in PSE such as safety spectacles, gloves, hard hats, ear defenders, etc for scouts to try.
get scouts to identify the hazard signs and then to look at the safety equipment and say when, where and how you would use them
Optionally, depending on age/enthusiasm/responsibility of group (extend running time appropriately):
Demonstrate how to isolate electrical and water supply mains using consumer unit circuit breakers and mains stopcock.
Make sure scouts understand risks of electrical work and how to be sure that electrical equipment or circuits are disconnected.
Ask scouts to prepare a set of instructions or a safety poster for a tool or DIY activity describing safe working &/or showing appropriate hazard and safety equipment symbols.