Right Angle Protractor puts 90-degree precision in your palm. This credit-card-sized, 2 mm transparent acrylic plate is laser-etched with bold black scales: a 100 mm ruler, 180° protractor arc, and a clever corner cutout that instantly squares edges. Snap it against timber, paper, or tablet screens; the beveled hypotenuse eliminates parallax, while anti-slip silicone dots keep it steady. Mark through the 0.5 mm guide holes for flawless miters, sketches, or geometry homework. Pocket-proof and shatter-resistant, it turns any surface into a drafting table—no apps, no batteries, just draw, cut, and measure right every time.