"As a gas manometer it is a good as it gets - assuming you know how to use one.
However it is NOT as shown - you need to buy the specialist rubber tube (£10.99) so that you can connect it to the gas pressure test port.. Hence only 2 starts for features as you may not be able to use it "straight out of the box"
Don't try to use cheap neoprene tubing - it won't seal properly and may well leak gas.
So the total cost for this manometer and tube is almost £31 as against £16 for the competition - all water manometers are equally accurate , so the choice is yours. Hence 2 stars only
Having said that I like mine and luckily I already have the correct tube ......"
"bought this and it is NOT the manometer shown in the picture/catalogue, it is a new 1 from rothenberger that doesnt have a hose which means you have to buy one costing £11, better waiting a day & buying the monument gauge saving £9"