a. This is used for measuring short lengths less than two metres. These are divided into centimetres, half centimetres, and millimetres b. The fixed end hook is placed in a position to take an inside or outside measurement, so it is important to position it correctly. It is best used for taking bigger measurements. These may be up to 100 metres long. c. This is a device for performing numerical calculations. It replaces the need to manually perform the calculations in your head and is especially useful when dealing with big equations that would take time and effort to work out manually. d. These have made a good name in the world of woodworking. This allows the carpenters and woodcarvers a more convenient way of measuring wood and lumbers. That is why many people turn to these because they do not have to check and count the thin lines on the this, These can be used for making accurate measurements of anything. You can point it an object. and the distance will show up on the device's LCD screen. e. This is a must-have for any serious woodworker. Finding the right angles are a crucial element of any woodworking job, as you want to bring together the various pieces of your project perfectly at the comers. Without the ability to accurately measure angles, you would be left to make educated guesses - and guessing should never be in a woodworkers/carpenter's mind. Some of the projects that this tool will help with include crown mouldings, door frames, trim, and more. Since it does inside and outside angles as well as offering a full 360o measuring range, you will find that this tool is extremely versatile. It is easy to learn how to take accurate measurements and it is sure to find a permanent place in your toolbox after just a couple of uses. . Another essential piece of gear for a woodworker/carpenter is a quality set of these. This is a simple tool to use, as you just need to slide this around the object in question to receive an accurate measurement. Finding the thickness of a piece of wood, or the size of a gap between two pieces of wood, is the strength of this tool. Many models are accurate to within 1/1000th of an inch, meaning you can extract a far more-accurate measurement by using this than you would ever be able to achieve with an analogue model. Even if you are not sure that you absolutely need a these to complete your projects, you may want to pick up one of these handy units anyway. They are a tool that certainly fits into the category of'used more than expected . As with the other digital measuring equipment, it is only a matter of time before you find that these are being pulled from your toolbox time after time