The Rulex Map Scale Card is a credit card size scale ruler specially designed for Ordnance Survey maps.

The handy credit card size makes scale cards easy to carry in your pack, pocket or wallet.

They feature the most popular OS map scales – 1:25000, 1:50000 and 1:40,000. 

So you can measure distances accurately to within 25m (at a scale of 1:25000).

The card also features a depiction of Naismith’s Rule which helps you to calculate the time that your walk will take.

Scale cards are made from 1mm thick flexible ABS plastic and are UK manufactured.