absolute zero demonstrator

[phillip o]

We have one of these - bulb connected to a long tube with a pressure release valve and a pressure gauge at the top. The gauge goes from -100kPa to +300kPa. Has anyone ant idea of where I would get a replacement gauge? Serrata doesn't!

[Laverne]

We have one too. I don't think it has worked properly since the day we bought it. I do know the former HT and a teacher have had a go at making it work but I don't know whether they have had success. As to the replacement gauge I don't know. Sorry.