What does "can be reused 20x" mean if they don't require recharging?

Yes sometimes you don't need to recharge it. Rainy days go to pink, sunny days go to blue again. If you change humidity level lower, they can go back to blue again. You can use hair dryer or sunlight to lower humidity level. Thank you.

What country are these manufactured in?

They are manufactured in South Korea.

Are they safe to use in food containers?

No they are not safe for food. Thank you.

Hi, are these cobalt-dichloride or cobalt-chloride free? when do they expire?

Blue to pink humidity indicator cards contain cobalt chloride. There's no expiration date on humidity indicator cards. As long as you keep them in tight sealed container with silica gel packet, they will last for long time. Humidity indicator cards are sensitive to temperature, humidity, atmospheric pressure, and wind. Therefore, they do not work well in open air. They work well and display accurate relative humidity level in enclosed space. The humidity card itself is reusable. When the humidity level is high, the dots will change from blue to pink and when the humidity level is low, the dots will change from pink to blue again. With long use, the color of the dots may fade away. Then, you can replace the card. We do carry cobalt free humidity indicator cards (green to purple). You type ASIN B01DYOR0WY in Amazon search bar. Color change is not as clear as blue to pink (cobalt chloride) cards. Thank you.

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Dry & Dry Premium Humidity Indicator Cards (12 Cards) - 10-60% 6 Spot(Reusable)

Dry & Dry Premium Humidity Indicator Cards (12 Cards) - 10-60% 6 Spot(Reusable)

Product ID: 167108032

Details

Battery description
No batteries
Brand
Dry & Dry
Colour
blue
Item weight
0.02 Kilograms
Mounting type
Tabletop

🎯6 precise humidity spots (10-60%)

🔄Reusable 20+ times

🔵🔴Clear blue-to-pink color shift

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Description

🔵🔴 Stay ahead of moisture—monitor like a pro with Dry & Dry!

INSTANT VISUAL ALERTS - Clear, reliable color change from blue (dry) to pink (humid) for quick status checks.
PRECISION AT A GLANCE - 6 distinct humidity levels from 10% to 60% for pinpoint moisture monitoring.
TRUSTED INDUSTRY STANDARD - Highest quality, rigorously tested for consistent performance and durability.
ECO SMART COST EFFECTIVE - Reusable over 20 times, reducing waste and saving you money.
DESIGNED FOR ENCLOSED SPACES - Optimized to deliver accurate readings in sealed environments, perfect for sensitive storage.

Dry & Dry Premium Humidity Indicator Cards offer precise, reusable humidity monitoring with 6 color-changing spots covering 10-60% relative humidity. Designed for enclosed spaces, these cards provide clear blue-to-pink visual alerts and can be reused over 20 times, making them an eco-friendly and reliable solution for protecting sensitive items from moisture damage.

Specifications

ASIN	B07D7LSZZP
Battery Description	No batteries needed
Best Sellers Rank	198,901 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 3,252 in Blank Greeting Cards
Brand	Dry & Dry
Colour	blue
Customer Reviews	4.1 4.1 out of 5 stars (124)
Item Weight	0.02 Kilograms
Manufacturer	Dry & Dry
Manufacturer Part Number	DDHUMID20PK-6 DOT
Model Number	DDINCCRD10
Mounting Type	Tabletop
Operating Humidity	10-60%
Temperature Accuracy	2
UPC	712396969211
Upper Temperature Rating	30 Degrees Celsius

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Buyer Protection · Full refund if your order doesn't arrive as described.

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