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How to use a tape measure accurately
The difference between Imperial and Metric measuring systems
Some of the different types available
How to read Imperial (inches) measurements
How to use the little diamonds on the tape when setting out Centers for Joists/Rafters/Stud Walls etc.
An absolutely essential hand tool for all trades not just Carpenters. I use mine all day long to obtain accurate measurements when pricing work and then when working on site. I've got a couple of different designs I use depending on what I'm doing/measuring.
I like Stanley Tapes because I work in Imperial and Metric and they display both. Also the Stanley Fatmax Tape Measure I use for First Fix/Framing Carpentry has a long 'standout', which means you can extend the tape out quite far and it will stay rigid - good for measuring long lengths or distances on your own. That and the PowerLock tape I use for Finish Carpentry too. It's less bulky than a Fat Max when in your pouch, while both have good clear and easy to read measurements and special coatings that make them last longer, important when you're using them every day.
The metal hook on the end of the tape moves backward and forward the same distance as it is thick. This is so when you are measuring in between two walls for example, then hook onto the end of a piece of timber that thickness of the hook is allowed for. So don't take it back to the shop like I once did when you notice this... Its intentional!