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.”

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.

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.

Improve compliance & documentation

Create a physical record of spray performance to support audits, training, trials, and best-practice documentation.

Built for real-world field conditions

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

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.

SpotOn®

Paper

Price range: $33.00 through $110.00 US List Price

How To Use SpotOn® Paper

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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