24" Bubble Folding Surface Level by Performance Tool. Get precise measurements at all times with superior-grade levels and accessories offered on our virtual shelves. Whether for a challenging situation or an everyday job, we have the solution that will work best for you. All levels and accessories are made using advanced technology and high-strength materials to be functional, accurate, and durable. With these products, you will measure angles and vertical lines with ease as well as make sure the surface is straight!