Very useful - Brunton Digital Map Measurer with automatic and manual map-scale setting

Very nice instrument but must be held properly, if you lean to either side the plastic will touch and the wheel will not make contact, giving incorrect information. Great for you can change scales easily.
Pros: this is a very accurate instrument
Cons: Care in holding the instrument is critical to get the accurate measurment.

This review was written in the old system and had content requirements that are different than reviews written today.