I just pruchased some 1mL plastic pipettes and some glass graduated beakers for testing chlorine concentrating using 10,000:1 dilution.
Just for kicks, I took a 1 mL pipette and filled up the graduated containers that come with the tfp test kit. I filled the pipette up to the 1 mL mark and squirted it into the chlorine only cylinder 5 times. Once finished the cylinder was filled to the 7 mL mark.
That's off by 40%.
The pipettes are graduated in 0.25 mL increments.
To verify the accuracy of the pipettes, I measured the weight of 1 mL tap water with a beam scale. The weight is 17.2 grains or ~1.115 grams at approx room temp. Distilled water should weigh approx .9966 at a close temperature which is only 11% difference.
I do not have distilled water to test.
I am performing these experiments as I type...
This is very interesting:
The cylinder with part # 9198 seems to be very accurate.
I filled this one 5 times with 1 mL tap water and it came to just above the 5 mL mark.
Then I removed 11%, or approx .6 grams (10 grains) and the water is touching the 5 mL line. Since there is no meniscus in the cylinder, it is hard to determine where the mark really is, but it is extremely close.
So, I guess I answered my own question using the cylinder part # 9189.
The chlorine cylinder and the other one is off by as much as 29% or around 1.45 mL.
I guess that is not too bad considering how expensive (or lack thereof) they were.