Once you’ve fitted a Chimney Balloon in your chimney you should notice a massive reduction in cold draughts in your home. However cold air has a knack of sneaking in through the tiniest of gaps, which can be hard to locate. The Smoke Pencil is an ingenious gadget for pinpointing air leaks and tracking down hard-to-find gaps. When the trigger is pressed, a plume of smoke-like substance is released. This is actually generated from a harmless glycerine-like fluid, giving off a slightly sweet smell. When the trigger is released, the “smoke” stops, making it highly controllable. The Smoke Pencil Pro kit comes with attachments that enable a very fine stream of smoke to be created which means the tiniest of air leaks can be pinpointed. The field kit comes with a fan contraption and two gauges of tip that can be attached for issuing a very fine flume of smoke for detecting the smallest of air leaks. There are six batteries for the Smoke Pencil and one for the fan. There is an 80ml bottle of fluid (enough for several hours’ worth of draught investigating), a screwdriver for the base so you can fit the batteries easily, and instructions. This pro kit is in a soft case for easy stowage.