It is kind of working on most guitars but the bar is far too short for classical guitar. There are 2 major design faults apart from being too short. Firstly, there is an unnecessary curvature on the bar and the rubber cushion which makes less pressure on the 3 middle strings and consequently affects the sound output. Secondly, the trigger is far too stiff to operate. The only positive thing about this capo is its price but it is strange why they made such a lousy design. So if you are looking for something better pay a few pounds more.
This capo is identical to the Tiger Universal, but a couple of quid cheaper. Very cheap. Very very cheap. Works brilliantly on small radius electric neck (Classic 70s Strat 7.25 inch radius). Did I say it was cheap and works brilliantly on a 7.25 inch radius electric guitar neck? If you require the above, pay no more.