Tips are measured in 64's of an inch - so you can use a drill bit guide from the local hardware store to measure the new tip diameter. You may have to do a little simple math for things like 1/16 = 4/64's (size 4 tube) and then oversize to 4.5 to ensure the tip slides onto the taper of the remaining blank.
what can said does work, but i use a caliper. and simple dial one will cost maybe ten bucks, and you just pop off the old top by heating the tube and pulling with pliers. then take the measurement there.
Another very easy way is to take it to any good tackle shop, they will have it done if 5 minutes and it'll only cost you a few bucks for everything. Hope this helps good luck
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