Device for testing horizontality, thus something flat, such as a plain

Let's find possible answers to "Device for testing horizontality, thus something flat, such as a plain" crossword clue. First of all, we will look for a few extra hints for this entry: Device for testing horizontality, thus something flat, such as a plain. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.