I have been using a 10ml syringe to accurately fill my cuvette for awhile with no problem. I recently bought new cuvettes from saltwateraquarium.com they came and they weren't the same as the old ones and fill past the 10ml line. I thought maybe I got some bad cuvettes so I ordered more from marinedepot.com they were the same they fill up past the 10ml line. So im not sure if I'm supposed to fill to the line or use a syringe to accurately fill 10 ml??
Here is a picture of my old cuvette (on the left) and new cuvette (on the right) both filled with the same 10ml syringe with 10ml of water:
Here is a picture of my old cuvette (on the left) and new cuvette (on the right) both filled with the same 10ml syringe with 10ml of water: