TF-100 cylinder not marked correctly?

PoolBrews

Well-known member
Oct 16, 2019
87
Florida
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?
 

zea3

Mod Squad
TFP Expert
LifeTime Supporter
Jul 10, 2009
11,768
Houston, Texas
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

Mod Squad
TFP Expert
LifeTime Supporter
Apr 17, 2010
10,654
East Texas
Could be just a difference in the thickness of the plastic of the cylinder walls. Still pretty insignificant and nothing to fret over.
 

PoolBrews

Well-known member
Oct 16, 2019
87
Florida
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!