Hydrosensitive Spray Indicator Cards for Coverage Checks
A foliar or IPM spray only works where the droplets land, and the naked eye cannot see a thin, uneven coat until pests survive it. These cards make that coverage visible, turning the yellow paper blue everywhere a droplet hits. Clip a card in the canopy, run the sprayer, and read the blue stain for density, gaps, and drift at a glance. Each sheet is 2 by 4 inches, easy to pin on a leaf, a stake, or deep in the plant. A grower then sees exactly what the nozzle is doing before committing a full tank.
Water-Sensitive Paper for Nozzle and Calibration Tuning
Place cards at the top, underside, and interior of the canopy to check the spots a spray usually misses. The instant color change gives feedback on the spot, so an applicator adjusts pressure, nozzle, or speed and tests again. Dialing in coverage this way trims wasted chemical and cuts the drift that lands off-target. The cards also train new sprayers to see what good coverage actually looks like. A pack holds 10 sheets, enough to map a canopy or calibrate a rig across a season.
Key Features
- Instant coverage read: Yellow paper turns blue where droplets land
- Find the gaps: Shows density, misses, and drift at a glance
- Canopy-ready size: 2 by 4 inch sheets pin on leaves and stakes
- Tuning tool: Guides nozzle, pressure, and calibration changes
- Pack size: 10 sheets per pack
Technical Specifications
| Specification | Detail |
|---|---|
| Brand | Dramm |
| Type | Water/oil-sensitive spray indicator paper |
| Color Change | Yellow to blue on droplet contact |
| Sheet Size | 2 x 4 in |
| Sheets | 10 per pack |
| Use | Spray coverage, droplet density, nozzle and calibration checks |