I would like it to be higher than wider. The photos often show it higher but it really comes squatted and wider. Makes it a tad more difficult for me anyway to screw on and off. I have arthritis in my thumb joints and that is not the fault of the item but still a SORE point for me. No measurement indentations or none I located on this tank so you need to measure your solutions perhaps before adding them premixed to the tank. I know a lot of us fudge. I also wish they made it clear in directions of the fogmaster where the air lock needs to be positioned. I had it leaking and thought that might play a role so turned it 180 degrees around and that seemed to work.