Silva Neigungs-Und Kartenmesser-451131 Tilt and Card Knife, Plain, standard size

This is a quality product, as one might expect from Silva. Yes it is more expensive than the multiple cheap alternatives, but it has a huge advantage : it works faultlessly. I learned the hard way, I initially bought a cheapo: the mechanism was so stiff it nearly cut through the maps, and daft though it may seem, the scale was wrong ( 6 miles read off an O. S. Map showed as 7.5 on the 1:25000 read off, 6.0 on the 1:20000 read off - the map was an Explorer 1:25000. One downside, it only does Km. Hey hey I'll have to go metric at last!

Quite expensive but not particularly well put together. Very plasticky. Overpriced in my view. Doesn’t work well on plastic coated maps. Would not buy again.

Pity it does not have a scale in miles

It is so inaccurate as to make it useless for measuring distances of mountain trails on 1:25000 scale maps which is what I wanted it for.

A very useful, compact and light addition to my trekking gear.