Why do you need to choose a diameter tape, anyway? Because you want a quick and easy way to take a tape measure out of your pocket and find the diameter of a pipe or other round object. The best pipe diameter tape measure for your job can be solved by asking these questions:
Metric or inch, or both? Some tapes are marked in any of these 3 different scales.
Does a brand name matter? Lufkin tools have made a name for themselves. Pi-Cobra tapes are made in China, but they are less expensive, and longer.
What accuracy do you need? The pocket sized ones are quick and convenient. They are accurate to 0.01 inch. If you need a highly accurate one, check out Pi Tape. They cost about 10 times as much, and they can’t fit in your pocket. But here is their accuracy: Pi Tape metric tapes have a diameter accuracy of ± 0,03 mm up to 3 600 millimeters. Pi Tape inch tapes have a diameter accuracy of ± 0,001″ up to 144 inches.
PI Tape 24″ to 48″ Range Periphery Tape Measure ‑ 57‑065‑856
Pi Day is March 14. This year you can help celebrate by answering the question at the bottom.
Pi is the constant ratio of a circle’s circumference to its diameter, no matter what size the circle is. This is useful knowledge when you work with water pipes or oil or gas pipelines, and you need to replace part of it. You can measure the circumference and divide by pi. But there’s an easier way to do that.
Let a Lufkin Diameter tape measure do it for you. You just wrap it around the pipe, and read the diameter. Mathematicians call pi an irrational number, since it goes on for an infinite number of decimal places, but using a diameter tape is a very rational and easy way to find the diameter of a pipe. To see a little video on How to measure the diameter of a pipe, just click here.
Diameter tape measures are able to give you the diameter of a pipe, pipeline, log, or any other round object. They do it in 1 easy step. All you do is wrap the pipe diameter measuring tape around the pipe and read off the diameter. A regular tape measure would give you the circumference. Then you would have to divide by pi (3.14159). That adds another step, plus you would need a calculator, pencil, and paper to arrive at the diameter.
Do you need to find the diameter of a pipe or pipeline, and you don’t want to have to divide by pi? Of course, you can do it that way–Measure the circumference and divide by pi. But a more accurate way is to use a pipe diameter tape measure.
Other ways: Use a micrometer that is big enough to do the job. Or use a caliper, then transfer the size to a rule, then divide by pi.
Diameter tapes make the job easy, by doing all the work for you on an oil, gas, or water pipe, or anything round, like a tree or telephone pole.
People who don’t know they need a pipe diameter tape measure yet:
Boat repair professionals
Car repair people
I have given Lufkin diameter tapes to these 3 groups of people, and told them how to use it. It only take a minute to show them. They are in awe of the tape, and wonder why they never heard of them. My boat repair man broke his, and wanted to buy a replacement tape. That’s how handy these pocket tapes are. They even can be personalized with your corporate logo in full color.