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: 403038994

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 change

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$U1767

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Description

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

BUILT TO LAST - Reusable over 20 times, delivering long-term humidity tracking without constant replacement
PRECISION AT A GLANCE - 6 distinct humidity levels for accurate monitoring from 10% to 60% RH
VERSATILE ENCLOSED USE - Optimized for enclosed spaces to ensure precise humidity readings, perfect for sensitive materials
INSTANT VISUAL FEEDBACK - Clear, reliable color change from blue (dry) to pink (humid) for quick status checks
TRUSTED INDUSTRY LEADER - Highest quality, rigorously tested cards favored by professionals managing moisture-sensitive environments

Dry & Dry Premium Humidity Indicator Cards offer 12 reusable cards with 6 distinct humidity spots ranging from 10% to 60% RH. Featuring a clear blue-to-pink color change, these cards provide precise, continuous humidity monitoring in enclosed spaces. Designed for durability, each card can be reused over 20 times, making them an essential tool for professionals protecting moisture-sensitive materials.

Specifications

ASIN	B07D7LSZZP
Battery Description	No batteries needed
Best Sellers Rank	#81,734 in Kitchen ( See Top 100 in Kitchen ) #10 in Humidity Meters
Brand Name	Dry & Dry
Color	blue
Customer Reviews	4.4 4.4 out of 5 stars (641)
Item Weight	0.02 Kilograms
Manufacturer	Dry & Dry
Model	DDINCCRD10
Mounting Type	Tabletop
Operating Humidity	10-60%
Part Number	DDHUMID20PK-6 DOT
Temperature Accuracy	2
UPC	712396969211
Upper Temperature Range	30 Degrees Celsius

Reviews

H**R

I put these primarily in containers holding moisture sensitive materials, but I also stick them on the shelf in my work shop to keep tabs on the room humidity. Simple to use and last a really long time.

8.08.2024

P**H

Using these for 3D printer filter in vacuum bags and they work really well. Take a little while to colour change to ambient humidity but they are a great option to check on humidity in long term storage

4.05.2024

P**L

I understood this product to be able to change colour back multiple times. However when I removed it from its packaging all dots turned pink and never returned back to blue again.

10.06.2025

T**S

Tun was sie sollen

31.01.2026

M**F

Pros: Easy-to-use moisture level indicators that change color accurately. Great for storage, electronics, and collectibles to monitor humidity. Comes in a 50-pack, offering good value. Cons: Single-use, so they can’t be reset after exposure. Needs to be stored properly to avoid premature activation. Verdict: A handy tool for tracking humidity in sealed spaces. Works well, but best if paired with proper moisture control methods.

15.02.2025

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$U1767

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

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