Top critical review
39 people found this helpful
Easy to use, not bad value but not too accurate
on 4 September 2010
This is much easier than using a bit of cotton on the map or dental floss as I do! However, I find it reads a little short when measured against the map scale, by 3% to 5 %, despite taking up any slack in the wheel as recommended. I still use it but I calibrate it each time by achieving the same reading along the bottom of the map where the kilometer squares run in a line, and then I read the true distance from the map. Alternatively you could just up the reading by about 4%, although shorter distances have a greater error factor. Today it read 10.9K for a run I did, instead of 11.3K which is around 3% error. The other slight annoying thing is turning the needle back to zero every time you need to use it but this is probably common to all these type of mechanical map measurers. Overall, I cannot grumble for the price I paid. You might consider going for a higher priced instrument, but of course there is no guarantee of higher quality.