The yellow spray test cards turn blue to allow for quick and easy spray visualization: visualize spray coverage, droplet size and uniformity, and off target application. Improve crop health and yield by ensuring correct application of chemicals while reducing overspray and waste. Accurate spray patterns will ensure crops receive correct nutrients or protection. Get improved shelf life with the unique reclosable seal, included tweezer, and desiccant packet. Does not warp in humid conditions. Great for indoor and outdoor use. Available in three different sizes for increased flexibility in placement. Extra small 1"x3", small 2"x3" and large 9.75"x11.75". And also in multipacks for ease of ordering. SpotOn spray droplet paper is made in the USA by Innoquest, a leader in agriculture test and measurement products. In house proprietary production process is tightly controlled. SpotOn Paper is water activated paper or water detection paper that allows you to see spray coverage for agricultural applications. The paper test strips act as a testing strip for spray patterns. The water droplet card, otherwise known as water indicating paper, is a moisture sensitive paper that turns blue when wet. If you are looking for water sensitive spray cards for your sprayer uniformity test, spot on water sensitive paper is a great choice. This spray pattern test paper is made in the USA by Innoquest. The spray droplet paper can be used to reduce waste and environmental impact by ensuring the efficient use of resources through droplet size analysis. You use the spray test paper on plants in greenhouses or outdoors as a spoton sprayer calibrator. Another reason why spray calibration paper is so important is that it often necessary for regulatory compliance. Spot on paper is easy to use: place spot water sensitive paper within the target area before spraying, conduct spray operation as usual, inspect spray pattern paper to analyze the coverage, make necessary adjustments to sprayer settings and re-test. Water sensitive cards or water sensitive sprayer cards are an essential piece of any spraying operation. spoton water sensitive paper for sprayer coverage and spray uniformity is a straight forward effective product with a long shelf life.