VOS Graduated Measuring Cylinders are top of the line for those who demand accurate measurements. These are high quality measuring cylinders made by the leading Dutch medical and research instrument company, VOS Instrumenten.
This 250 ml cylinder is made of heat resistant Boro 3.3 glass and has a hextagonal base. It measures liquids in 2 ml increments with a 20°C +/- 2 ml accuracy.
Glass, unlike plastic, will not retain any chemical residue when properly cleaned.
For exact measurements of diluted chemistry, like TMax developer, medium-size graduated glass cylinders like this are indispensable. This is also a good size to accurately measure out the water for mixing.
The Brownie Camera Guy says:
In general, I like breaking rules however one die-hard rule in the darkroom is to always measure using glass cylinders and mix in a larger 1 or 2 liter plastic graduate. When mixing TMax or other 1:4 type dilution developers, using a medium-size accurate graduate is the best way to measure the chemical and to measure out the water for final mixing.