Conflicting test results

[FamilyGuy]

Is it typical or not to perform the fc 10 ml test and 25 ml test and get diff numbers?
Heres what i came up with
10 ml 13.5 fc. .5 cc
25ml 12.4 fc .4 cc
Just unsure of myself this is my first week taking control of my pool away from the pool store

 

[jblizzle]

Those are pretty close to each other and likely within the accuracy of the test.

Just use the 10ml and trust yourself.

 

[jcowart]

Those numbers look good. Unless your using a 25ml and 10ml pipette and your drop size is consistent. That seems to be within the natural testing error. Just remember that the bottom of the curved part of the water looking through the tube is your mark. Wipe the tip first to get static off the tip. Squeeze just to get a drop started and then let gravity take over.

Trust your results and do the 10ml sample. It saves on testing supplies.