If you use heat shrink of any kind you need one of these, from rewrapping batteries to electrical connectors it is an invaluable tool.

The normal way of shrinking heatshrink is either your lighter, a heatgun, or the hairdryer if you have none of the other items available at hand.

If you have used any of these items before, you would have been through burning the heatshrink to burning your fingers, this heat gun will quickly shrink your heatshrink yet not produce enough heat to burn your heatshrink and if used carefully will not burn your fingers whilst you hold your item.