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Review on πŸ“¦ Dry & Dry Premium 20 Pack Reusable Humidity Indicator Cards (10-60%) – 6 Spot – Includes 20 Cards by Isaac Shankar

Revainrating 5 out of 5

Very handy for 3D printing

I use these in my filament storage boxes to quickly measure humidity. This is especially useful for PETG filament which I need to keep dry. Of course it helps if your storage boxes or bags are clean so you don't have to open them to check your cards ;)

Pros
  • Perfect for outdoor activities
Cons
  • Some trouble