Small and portable. Professional multi-function high precision on-board compass. Ideal for marine, vehicle, boating, traveling, hiking, and outdoor activities. Outer tick of outer ring functions as a CM ruler; pointer rotates one full week per cm. Inner tick of outer ring features a 1:50,000 scale, compatible with 1:50,000 maps. Outer tick of inner ring features a 1:20,000 scale, compatible with 1:20,000 maps. Inner tick of inner ring features a 1:5,000 scale, compatible with 1:5,000 maps. Instructions: Set pointer to zero at the 1:1 scale. Align the small wheel to the starting point and roll along the route to the destination. Read the distance in kilometers according to the map scale. Material: Plastic Color: Yellow + White Package includes: 1 x Map Rangefinder Note: Light and display differences may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.