Half of the measurement scale on the dial face is highlighted yellow to make measurements easier to read. Also known as test indicators, they have a lever-style contact point that pivots as it comes into contact with a surface and a balanced dial with positive values on one side and negative values on the other side. All have highly sensitive, wear-resistant jeweled bearings for a long service life. Rotate the dial face for viewing at multiple angles. The ratcheting contact point can be adjusted to various angles. Mount the indicator into lathe tool posts, height gauges, surface gauges, and other setups with the included accessories.