History of caculator
You probably have a hammer, but that's just a start. These 20 tools and devices are superstars for household projects and repairs. If you love tools or just need to stock a basic toolbox, here are the top 20 necessary items to get your small project done. How many do you have? Philips screwdriver. A Philips or X-shape screwdriver is probably one of the most common tools in any toolbox. If you have a handle that accepts interchangeable tips, you can cover a wide range of screw types and sizes. Flathead screwdriver. A flathead or straight screwdriver is invaluable; most light switch plates use straight screws, for example. Having the right size flathead can make a difference, so start with at least a set of three (small, medium and large) to be able to handle most jobs. Tape measure. Your tape measure is indispensable for estimating material quantities, figuring out placement of objects, and calculating floor plans and furniture sizes. It's always a good idea to measure more than once to make sure you've got it right.