Good quality for an inexpensive price, will handle extensive use.

I bought the 300mm proslide square a couple of months back and have found its out of square. Never thought to check it for square .. I have owned Stanley combination squares before , thought i wood try it out ....

The only combination square I've come across that had everything I wanted:(a) metric on both edges of the ruler, and on both sides too;(b) measurements running in the same direction on both edges, or L-R on one edge and R-L on opposite edge;(c) quality machined piece that feels solid in your hands.