18" Bi-Rola Rule, Weems & Plath

Made with the professional in mind, the P.R. 500 has a considerably larger body than the smaller bi-rola™ rule. Built to take rigorous use aboard commercial and blue water vessels, the P.R. 500 provides one of the easiest methods invented for plotting courses. Dims: Length 19-5/8", Width 3-5/8", Thickness 1-1/4".

Features:



Patented four-way rolling motion

Roller body has protractor markings every 1/2 degree

1-1/4" magnifying lens for enhancing chart data

Easy to follow instructions

Packaged in a protective, durable vinyl pouch

Wt. 1 lb. 10 oz.