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

🔋No batteries needed

$28.58

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔍 Stay ahead of moisture—because your gear deserves the best!

VERSATILE DISCREET - Compact tabletop design fits seamlessly in storage, workshops, or packaging to protect sensitive items.
BATTERY FREE RELIABILITY - Operates without batteries, ensuring maintenance-free, always-ready humidity tracking.
SUSTAINABLE COST EFFECTIVE - Reusable over 20 times, reducing waste and saving you money on replacements.
VISUAL CLARITY YOU CAN TRUST - Strictly tested for sharp blue-to-pink color changes, eliminating guesswork in enclosed spaces.
EFFORTLESS PRECISION MONITORING - 6 distinct color-changing spots provide clear, real-time humidity levels from 10% to 60% RH.

Dry & Dry Premium Humidity Indicator Cards offer a reusable, battery-free solution to accurately monitor relative humidity between 10% and 60% RH. Featuring 6 color-changing spots that shift from blue (dry) to pink (humid), these cards provide clear, reliable readings in enclosed environments. Designed for long-term use with over 20 reuse cycles, they are ideal for protecting moisture-sensitive materials without the hassle of electronic devices.

Specifications

ASIN	B07D7LSZZP
Battery Description	No batteries needed
Battery description	No batteries needed
Best Sellers Rank	#32,453 in Kitchen ( See Top 100 in Kitchen ) #10 in Humidity Meters
Brand	Dry & Dry
Brand Name	Dry & Dry
Color	blue
Colour	blue
Customer Reviews	4.4 out of 5 stars 651 Reviews
Item Weight	0.02 Kilograms
Item weight	0.02 Kilograms
Manufacturer	Dry & Dry
Model	DDINCCRD10
Mounting Type	Tabletop
Mounting type	Tabletop
Operating Humidity	10-60%
Operating humidity	10-60%
Part Number	DDHUMID20PK-6 DOT
Temperature Accuracy	2
UPC	712396969211
Upper Temperature Range	30 Degrees Celsius

Reviews

K**I

しっかり反応する。大容量でお得

通常の湿度計と乾燥剤を一緒に密閉容器に入れて、時間経過による湿度の変化を見比べてみました。色による判断なので、だいぶ大まかな値にはなりますが、おおよそ、湿度計と同じ値を読み取れる感じです。完全なピンクにはならず、きれいな青が、ピンクがかかってくるとその湿度に達しているという感触です。

26.06.2026

H**R

Work great, no need for batteries

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

Work really well

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

Non reversible colour change

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

Passt

Tun was sie sollen

31.01.2026

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$28.58

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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