SpotOn Water Sensitive Paper (WSP) for Sprayer Calibration - One Pack of 9.75"x11.75" Paper - 5 Big Sheets - Reduce Waste and Ensure Consistent Application of Spray Droplets - Assess Spray Coverage

Well protected, responsive, small footprint: This product comes nicely encased in a protective film pouch that is thankfully resealable - given the moisture-sensitive nature of the product, I'm very happy I won't have to use them all at the same time and can in fact re seal them with a nice quality seal. The paper when in use is pretty responsive to moisture and really does assist me when I'm trying to spot leaks in my homemade hydroponic system. The sheets are also about the same size as a normal sheet of paper, so you can spread them out nicely to take samples of certain areas - these will not cover a huge footprint but will allow you to spot check several locations simultaneously. Overall, this is a good set and I would recommend.