The Hidden Worlds of the Klein Tools TI250 Thermal Imager
If you're looking for a more universally useful Klein tool to start your collection, they make a bottle opener with their signature handle.<p>As an added bonus, then you can confuse your mathematician friends by telling them you have a Klein bottle opener.<p>More practically, their screwdrivers are worlds better than average. The Phillips head tips are ground properly and are less likely to cam out when you don't want them to. They also make slotted drivers with a cabinet tip. They're sold at Home Depot (in the electrical aisle), so you don't have to hunt down an electrical distributor to get them.