A circular power saw can stop the blade from spinning in less than 5 milliseconds if it senses skin (like a finger!)
From the company: The SawStop patented Safety System stops on contact with skin! The saw blade goes from 4,000 RPM to zero in less than 5 milliseconds 10 times faster than a car’s airbag! (You can 2 company videos at the link below.) The new compact size with carry handle and on-board storage means you have everything you need at hand. Easy to adjust or remove and always square, the rack & pinion fence has built-in high and low shelf to support all types of cuts. Quickly and easily tilt the blade to your ideal angle. Further fine-tune with the micro tilt-adjust feature. And the Safety System to protect fingers and more. MSRP: $899.00
Giz Wiz Video: https://youtu.be/5Kij8wXC454
Company Video: https://images-na.ssl-images-amazon.com/images/I/F1wDGmNxkCS.mp4
Amazon: https://amzn.to/401j1WB
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