J&R Products 25 Inch Attic Measuring Ruler - Case of 1000 - Durable Construction Measuring Tool for Home Improvement, Roofing & HVAC Installation

Staple these R-Value rulers to attic joists to get the correct amount of insulation. This Universal (1″ increments) ruler used with all types of blown insulation to provide a working gauge for installer and insurance depth to inspector and owner. Made of cardboard stock 25″ long.