The Precision Protractor Inclinometer V Groove Framework is truly a remarkable tool for any industrial and scientific use. Based on my experience this protractor has proven to be accurate and reliable, allowing me to take precise measurements with ease. The V groove framework is an added feature, which enhances the stability and durability of the protractor .However, the only con I have noticed is that it requires some level of expertise to use. Overall, I would highly recommend this protractor to anyone looking for a high-quality dimensional measurement tool..