Bullseye levels center an air bubble in the middle of their circular face to indicate when a surface is horizontally even (level). They sit on furniture, machinery, appliances, or other equipment to provide a basic gauge for leveling.

Pocket levels work like miniature box levels, using their bubble vials to indicate whether surfaces are horizontally even (level) and vertically straight (plumb). Also known as handy levels, they are compact to store in a pocket, drawer, or toolbox.

Line levels suspend along a length of string that's pulled taut between two points and assist with finding level between the points. Also known as string levels, they slide their looped ends onto the string and confirm level when their air pocket rests in the center of the bubble vial. They are commonly used over long distances when installing pavers and grading surfaces. Their flat bottom also allows them to sit directly on surfaces to check whether they are horizontally even.

Fence post levels grip onto poles, pipe, and framing to check whether they are horizontally even (level) and vertically straight (plumb). They have multiple bubble vials for taking readings.