Map Measurer

Product Code : EL-MAILE-10855

Map Measurer (code EL-MAILE-10855) is a mechanical opisometer, also called a curvimeter or meilograph, used to measure the length of curved lines such as roads, rivers and other line features on maps. This double sided, water proof map measure adds and subtracts distance, has a smart wheel setting and a reset dial that also counts revolutions, and reads 1 metre per revolution on side one, with 1:25, 1:50, 1:75 and 1:100 scales on side two.

Get a quote: use the Add To Cart enquiry button below, or send your quantity and delivery location through the contact page.

Specifications

What Is the Map Measurer Used For?

Measuring a winding road or river on a map with a ruler is slow, so an opisometer is run along the line instead. The user sets the wheel at the start of the route, rolls it steadily along the line to its end and reads the distance from the dial; the distance on the ground then follows from the map scale, using the scales on side two or the 1 metre per revolution reading on side one. Because the measurer adds and subtracts, separate legs of a route can be totalled or a wrong section taken back. It is used in geography, surveying and route-planning work.

What to Specify When Ordering

• Quantity — the number of map measurers required.

Frequently Asked Questions

What is an opisometer?
An opisometer, also called a curvimeter or meilograph, measures the length of arbitrary curved lines, most often roads, rivers and other line features on maps.

How does the wheel measure a line?
A toothed wheel of known circumference is run along the line; the line length equals the wheel circumference × teeth counted, divided by the number of teeth on the wheel.

What scales are on the two sides?
Side one measures 1 metre per revolution, while side two carries scales of 1:25, 1:50, 1:75 and 1:100.

Can distances be added together?
Yes. The measurer adds and subtracts distance, and its reset dial also measures the number of revolutions made by the wheel.

Can it be used outdoors?
It is water proof for use in all weather conditions, and the smart wheel setting gives a quick set-up before each measurement.

OEM Manufacturer

Engineering Lab Equipment (Engineering Labs Equipment Pvt Ltd) builds the Map Measurer at its works in Saha, District Ambala, Haryana (Plot No. 43, Industrial Park, Sector 2, Growth Center). Its measuring instruments and instrumentation trainers for engineering laboratories go to engineering colleges, polytechnics, technical training institutes and research laboratories in India and abroad, and equipment can be made to an institution's own requirements. For tenders and OEM supply, see the Tenders/OEM page.

Related Measuring Instruments

• Digital Planimeter — roller or polar type area measuring instrument with 6-digit pulse count and scale readout.
• Metric Metal Ruler — stainless steel rule in 15 to 100 cm lengths with black scale and mm-inch table.
• Fiber Glass Measuring Tape — fiberglass reel tape in 30, 50 or 100 m lengths with metric and imperial marking.

See the full Measurement and Instrumentation Lab Equipment range or all Mechanical Engineering Lab Equipment.

Request a Quote

For this and other measurement and instrumentation lab equipment, schools and colleges can contact Engineering Lab Equipment, a manufacturer, supplier and exporter based in Ambala, India. For a price, send the number of map measurers required and the delivery location through the contact page; the Add To Cart button on this page also adds the Map Measurer to an enquiry.

Last updated: October 2026