I tested two new rulers for squaring up my blocks. I liked them both for different reasons, so I don't think I had an overall favorite. The perfect 5 ruler from creative grids. I liked this one because you can do multiple sizes (up to 5 inches). This ruler also has sticky/grabby patches on the back that really hold the fabric in place and prevent sliding. To use it, you just line the diagonal of your block up with the diagonal line and then use the grid lines to trim to the size needed. (this ruler also comes in a \\"perfect 10\\" size.) Bloc Loc 2.5\\" Half Square Triangle Ruler. I liked this one because it has a little groove that \\"locks\\" to the seam of your half square triangle. I found this ruler would slide a tiny bit if I added too much pressure when cutting, but It was very easy to use. If price were no object I would buy this ruler in a few different sizes, but they are pricy compared to the perfect 5 rulers. You can see the comparison in the video I attached to this post. For larger squares, I am still using my June Tailor Perfect Half-Square & Quarter Square Triangle Ruler.