Our indicators are already in use by DOTs (highway departments), road districts, parks & recreation departments, landfills, military, municipal & county governments and USDA forestry. All tube-type indicators use a precision boro-silicate glass tube filled with a special dampening liquid that will operate in temperatures from -40º F to +180º F. The glass tube is tucked into the body for protection and to prevent dust and dirt build-up that could obscure visibility of the tube. The indicator bodies are made of a rugged ABS compound and flat black to prevent glare. A series of ribs is built into each body to make them crush-proof. Easy mounting bolt mounting, using 2 screws. Size: 9"W X 21/4"H
 
Reads side-to-side tilt from: 5.5%-0-5.5%