Integra Boost Humidity Indicator Cards — Pack of 10

Integra Boost Humidity Indicator Cards — Pack of 10, Colour-Change RH Monitors

Inexpensive, accurate way to quantify relative humidity levels without a digital meter — Integra Boost humidity indicator cards show coloured spots that turn from pink to blue as humidity changes. Simple to use, instant visual verification. Particularly useful for curing jars during harvest, where you want to confirm each jar is at proper cure RH (62-65%) without opening every jar to test with a probe.

Why growers choose Integra Boost cards:

• Inexpensive RH monitoring — far cheaper than digital hygrometers for multi-jar monitoring
• Instant visual verification — glance at the card, see the humidity level — no tech required
• Pink-to-blue colour change — clear transition indicates humidity band shifts
• 10 cards per pack — enough for multiple curing jars simultaneously
• Perfect for curing jar monitoring — verify each jar is at 62-65% RH for proper cure
• Simple to use — drop a card in each jar, check visually when you open
• Accurate at the key cure humidity range — designed specifically for the 60-70% RH target band

Who it's not for:

For continuous precise RH monitoring across a whole grow room, a digital hygrometer (ProHygro, Grow Gadget) is more practical. Indicator cards are single-use-over-time — once they've been used in a jar for months, replace. For active RH control (not just monitoring), you need a humidifier/dehumidifier pair with a controller. Pair with Boveda or Integra humidity packs for active cure RH regulation.

In stock now — ships same working day from our Staffordshire warehouse with free UK delivery over £100. Pick up in-store at our Stone shop (ST15 0SR) if you're local, or click & collect at checkout.