Hydrosensitive Paper (Spray Indicator Cards) - 10 Sheets - 2" x 4" Intake making it a favorite among

making it a favorite among gardeners and horticulturists

so nothing is guessed

Its thin-film composite material delivers consistent results

Pressure-Induced Filtration Mechanism: As water enters the filter and pressure builds

It drives output pressure to 150 PSI and needs only 30 PSI of incoming water to reach full flow

Hydrosensitive Paper (Spray Indicator Cards) - 10 Sheets - 2" x 4" Intake making it a favorite amongHydrosensitive 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,