Place a ball bearing or marble on it, see if it rolls.
Because the tube is partly filled with coloured spirit or alcohol so the air bubble is more visible.
A bubble of air is in a small slightly curved tube of alcohol. The bubble will float at the highest point and indicate level or not level.
keep trying or check you-tube
To level a surface (a shelf, for instance) a spirit level is placed on the shelf that is fixed at one end only. The free end is lifted until the bubble in the sealed tube is between the two marks. The shelf is now level and can be safely fixed to the wall.
The level holds a tube of oil with 2 marks set 5millemetres apart at its centre. a bubble of air will travel along the tube in the opposite direction to the angle the level is held at. When the bubble sits between the 2 lines it indicated that level is either horizontal or if the tube is set so it can indicate a vertical then it shows that the level is vertical . Used by builders in the main it helps them ensure that items are true vertical ( a wall for instance) or true horizontal (a kitchen work top for instance)
Yes, provided both end of the tube are open and there are no air bubbles present in the water-filled tube
You need to unbolt the tube, pull it out, replace the o ring, reinstall, and check the fluid level.You need to unbolt the tube, pull it out, replace the o ring, reinstall, and check the fluid level.
Through the tube used to check the fluid level.
If it's an auto through dipstick tube. Check level when running.
You refill transmission fluid through the transmission dipstick tube. Remove the dipstick and, using a funnel, pour fluid into tube slowly in small amounts and check level each time. DO NOT OVERFILL!!! Good luck.
in the oil filler tube... ie the same place you check the oil level
Through the fluid dipstick tube. Ensure you check level will idling....