The accuracy is okay, but it's a mediocre product for professional use in terms of quality; the filters rusted after one use even with good cleaning afterwards in their box and lubrication.

It did its job just fine.. For motorcycles, something like this is needed with a wide range of gradation in the low numbers.. Pay attention to the screw that holds the blades.. it needs to be tightened every time someone takes out a number.. Otherwise, it may fall into the engine... And then a magnet and patience...