To measure pressure on an inclined manometer to better than 1% accuracy: Group of answer choices When it is inclined at 10 degrees to the horizontal, we need to know the angle within +/- 1.0 degree You must always read the top of the meniscus when checking the zero level and the bottom of the meniscus when taking any readings When checking the zero level in manometers you must always read the bottom of the meniscus but when taking any other reading it does not matter When it is inclined at 90 degrees (i.e. vertically), we only need to know the angle of inclination to within +/- 5 degrees This is incorrect - you cannot measure to 1% accuracy on a manometer