"I was working at ground level so I enlisted the help of my laser level tripod to give me a constant height from the foundation for the first vessel. No problem with the help of a couple of electrical tie clips. I then clipped on the second vessel to a stick so that the two levels matched at the required height. I found that the level worked far smoother when I added a few drops of washing liquid to the water. It also dissipated the bubbles faster. Just for fun I added some black current juice to give it all a bit of colour. Oh don't forget to take the caps off."
"What a simple device! Just fill with one end lower than the other until full, and no air bubbles, as noted. Both ends are cable tied to stakes in the ground and roughly eyed in to start with, the thing which everyone is missing is to leave the caps off! Top up as neccesary, you can walk around slowly in a circle and the response is immediate. Think Pyramids!!!!"
"This is only really useful for measuring levels > 1 foot from the ground (unless you use a graduated stick to hold the water level at a consistant height from the ground / datum) I found filling from the garden tap the best and to let it flow through and out the other end for a couple of minutes to get rid of all the bubbles. Any bubbles really slow down the response time and accuracy. I used it to measure out building foundations (cross checked with a laser level once it got dark!) and it was spot on. I found using a graduated stick worked fine. You will need 2 people to use this. As far as accuracy is concerned, you can't argue with gravity!"
"I initially got it to level big patterned wallpaper round a room (not wanting to buy a self levelling laser kit) but totally useless. As another writer said, paving slabs are too low for it, but anything over a foot it would be great. Best to syphon the water through the pipe to make sure no air bubbles. When no air bubbles, found very accurate."
"I thought this would be perfect to level out my garden ready for paving stones as you don't get any better than gravity. Just too awkward to use at low level. slow to fill. slow to get level. Probably a lot better for doing things higher off the ground."