Water Sensitive Paper for Agriculture, Spray Testing & Drone Applications

SpotOn® water sensitive paper is the industry standard for evaluating spray coverage and droplet deposition. The yellow paper turns blue on contact with moisture, allowing applicators to quickly visualize spray coverage, droplet size, spray uniformity, and off-target application. Whether you’re calibrating sprayers, testing nozzles, or conducting agricultural research, this water sensitive paper provides a simple, reliable way to measure and document spray performance.”
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See what your spray is really doing

The bright yellow paper instantly turns blue on contact with liquid, creating a clear visual record of droplet placement, density, and uniformity.
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Optimize coverage & reduce waste

Quickly identify under-application, overlap, or off-target drift so you can fine-tune flight paths, nozzle selection, pressure, and application height.
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Improve compliance & documentation

Create a physical record of spray performance to support audits, training, trials, and best-practice documentation.
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Built for real-world field conditions

Trusted by applicators worldwide, SpotOn® Paper performs reliably in both ground and aerial operations.
Full SpotOn® Paper Specs

The SpotOn® Paper Difference

Not all water sensitive papers perform the same. SpotOn® water sensitive paper helps applicators evaluate spray coverage, droplet distribution, nozzle performance, and pesticide application accuracy in real-world field conditions. While other water sensitive papers may produce uneven color response, distorted patterns, or inconsistent field performance, SpotOn® Paper delivers sharp, accurate impressions that clearly reflect spray coverage, droplet distribution, and application quality. The result is faster evaluation, more confident adjustments, and better documentation. Whether you’re calibrating equipment, validating drone spray patterns, or conducting agricultural research, SpotOn® Paper helps you see exactly what your spray is doing.
Technician placing SpotOn Paper, water sensitive paper, in a soybean field to evaluate spray coverage and droplet distribution during pesticide application.

Better High-Humidity Tolerance

SpotOn® Paper is engineered to perform in real agricultural environments, where heat and humidity are unavoidable. Its moisture-resistant construction helps prevent premature activation and inconsistent results, delivering reliable spray coverage data.

Ideal for agriculture, aerial application, drone spraying, turf management, greenhouse operations, and research trials (for laboratory settings and ultra-fine droplet analysis, rely on SpotOn® Paper Pro, it detects droplets as small as 30 microns).

Doesn’t Warp in the Field

Unlike many water-sensitive papers that curl or deform when exposed to moisture, SpotOn® Paper stays flat during application and collection. This ensures clean, accurate spray impressions, easier placement in crop canopies, and more consistent interpretation, so you can trust your data from the field to the lab.

Water sensitive paper placed within a soybean crop canopy to capture spray coverage, shown alongside product information about SpotOn® Paper staying flat in field conditions without warping.
SpotOn® water sensitive paper packaging with product information highlighting a 3-year shelf life and Made in USA manufacturing for reliable spray coverage analysis.

Long 3-Year Shelf Life & Made in the USA

SpotOn® Paper is proudly made in the USA and designed for long-term reliability, with a sealed shelf life of up to three years. That means dependable performance when you need it, less product waste, and confidence that every sheet meets the same high standards, season after season.

Spot Success With SpotOn® Paper

SpotOn® Paper is available in three practical formats to match any application. 1″ × 3″ cards for quick nozzle checks and targeted spot testing, 2″ × 3″ cards for broader spray pattern analysis, and 9.5″ × 11.75″ sheets for full-coverage evaluations, training, and demonstrations. Whether you’re fine-tuning individual outputs or documenting large-area performance, there’s a size designed to deliver clear, accurate spray insights.
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Paper

Price range: $33.00 through $110.00 US List Price

Water Sensitive Paper Frequently Asked Questions

Have questions about water sensitive paper, spray coverage testing, or droplet analysis? Explore answers to common questions about how SpotOn® Paper works, where to place it, how to interpret results, and how it can help evaluate agricultural, drone, aerial, and ground spray applications.

SpotOn® Paper is designed for practical field applications, education, spray testing, and demonstrations. SpotOn® Paper Pro is intended for scientific, laboratory, and controlled research applications that require greater sensitivity and precision. Paper Pro can detect droplets as small as 30 microns. More details here.

SpotOn® Paper is available in 1″ × 3″, 2″ × 3″, and 9.5″ × 11.75″ formats. Smaller cards work well for field placement and targeted testing, while the larger sheets are useful for broader evaluations, demonstrations, and training.

Keep SpotOn® Paper resealed in its original packaging and protect it from moisture, wet hands, and high humidity when not in use. SpotOn® Paper has a shelf life of up to three years when unopened and properly stored.

Yes. Water sensitive paper is a useful tool for evaluating agricultural drone spray patterns and droplet deposition. Cards can be positioned across the application area to help visualize coverage, distribution, and potential off-target spray. The results can also help when evaluating flight paths, application height, nozzle selection, and other spray parameters.

Water sensitive paper is commonly used to evaluate agricultural spray applications, including boom spraying, airblast spraying, aerial application, drone spraying, and handheld or backpack spraying. Applicators can use the results to evaluate coverage and make informed adjustments to equipment setup and application practices.

Water sensitive paper reacts to moisture. When spray droplets contact the yellow surface, they create blue marks that show where droplets landed. The resulting pattern can be evaluated to better understand spray coverage, droplet distribution, and application performance.

Water sensitive paper is specially treated paper used to visualize spray coverage and droplet deposition. The paper is yellow when dry and turns blue where it comes into contact with liquid, creating a visible record of where spray droplets landed. This makes it useful for evaluating spray coverage, distribution, uniformity, and off-target application.

To use, first deploy the paper in the target spray area. For field or aerial spraying, use the SpotOn® SprayTarget (item #44960) — coming soon. Alternatively, attach the paper directly to branches, leaves, or vines by clipping or stapling it in place, or attach it to blocks spaced 1–3 meters (3–10 feet) apart for aerial applications. Be sure to note the location on the back of each card. After spraying, allow the paper to dry, then collect and analyze the samples.

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