TF-100 cylinder not marked correctly?

[PoolBrews]

Not sure why I tried this, but I found that when I fill the cylinder marked with black numbers to 10ml, then pour that into the one with clear numbers, it shows 11.5ml. If I pour it into the chlorine cylinder, it shows 10ml. Based on this, I'm assuming that the clear cylinder is marked incorrectly?

Curious if anyone else has noticed this... or is this specific to my cylinders?

 

[Texas Splash]

Funny, I never noticed that myself. Did the same with two sets of my tubes. Unfortunately I don't have a precision measurement device to confirm which is accurate. Someone here will. I think @OTPirate and @Leebo are on the road right now, but I'm sure they will have more to say just as soon as they can catch up to messages.

 

[zea3]

I'm sure it has to do with the standards of different manufacturors being slightly off from one another. Rebecca can confirm when she gets a chance. It is more important that the test is performed consistently with the same vial dedicated to that test to insure comparable results over time. It shouldn't affect the accuracy of your testing.

 

[woodyp]

Could be just a difference in the thickness of the plastic of the cylinder walls. Still pretty insignificant and nothing to fret over.

 

[PoolBrews]

Further testing reveals that the cylinder with the clear markings is off consistently by 1.5ml. i.e, if I put 25 in either of the other 2 cylinders, it shows as 26.5 in this one. Must the specific cylinder - just wanted to make sure this wasn't for a specific test different than the others! Thanks!