Which of the following is not a type of level?

this is a great explanation, detailing both the correct and incorrect answers.

Shortly after I bought my house, I went shopping for tools to build a good toolbox. I got all the usual, hammer, lots of nails, different sizes and types of screwdrivers, etc. I figured I should have a level, so I bought three different ones. Thirty years later, I have never needed a level.

try, half empty bottle of alcohol is a good level also. That is how Great Wall of China was laid and why it is perfectly level, for up to 13 cm length in some areas.

well, I would use a plumb bob to do vertical. a hose and water to ascertain the difference between levels. I own screed levels etc.