Found this handy little site
handy for making a dipstick measure tool for your HLT
http://home.iprimus.com.au/foo7/tank.html
The outcomes pertain to: A perfectly cylindrical tank, with completely flat top and bottom ends, which is not tilted in any way and can be filled to the hilt.
If the cylinder is domed at the top then measure the height excluding the dome.
handy for making a dipstick measure tool for your HLT
http://home.iprimus.com.au/foo7/tank.html
The outcomes pertain to: A perfectly cylindrical tank, with completely flat top and bottom ends, which is not tilted in any way and can be filled to the hilt.
If the cylinder is domed at the top then measure the height excluding the dome.