Ultrasonic liquid level tester for carbon dioxide cylinders...

 ...whether your CO2 cylinders are vapour or liquid withdrawal (e.g. as back-up for -70 to -80 freezers), estimating the contents of the cylinder and knowing when you're going to run out or if you have run out of gas is not easy.
Irrespective of liquid contents, the pressure in a carbon dioxide cylinder is always the same - so a pressure gauge is no real use. You could weigh the cylinder and subtract the tare weight - this is impractical and can introduce quite serious manual handling issues. Consequently, use our ultrasonic liquid level checker to quickly and accurately find the answer - simple to operate, reliable and made in Britain.

Follow the link for more information:- https://www.youtube.com/watch?v=fTJEw786SAI