I think that it is a compact, highly accurate, well-made product. However, before purchasing, I did not notice that the specification "100 mm" is not the length of the reference plane, but the length including the side protector (10 mm on each side). Depending on the application, the length of the reference surface is also important, so I think that this point will be a kind explanation if it can be included in the item description.
Cheap, light, easy to hold, and useful. Since there is no groove on the bottom, it is a little unsuitable for measuring the slope of the piping, but it still performs enough. The size of 450 is saved without becoming a big obstacle to the tool basket.