Slim color-changing air quality card on a light desk beside a laptop and small plant, green indicator zone

Pocket Air Quality Card (CO₂ Indicator)

$18.00
$18.00
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Slim color-changing air quality card on a light desk beside a laptop and small plant, green indicator zone
  • Slim color-changing air quality card on a light desk beside a laptop and small plant, green indicator zone
  • Slim color-changing air quality card on a light desk beside a laptop and small plant, green indicator zone
Pocket Air Quality Card (CO₂ Indicator)

Pocket Air Quality Card (CO₂ Indicator)

$18.00
$18.00

Know your air at a glance. This credit-card-sized colorimetric indicator changes color with rising CO₂ levels — green for fresh, amber for stuffy, red for "open a window." No batteries, no app, no setup. Slip it in a classroom, office, or nursery and instantly see when it's time for fresh air. Lasts up to 6 months.

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