Reversible humidity indicator 40 x 119 mm 200 sheets E133-4-A1 1 bag (200 sheets)

You can check the humidity inside an airtight container or pack from the outside. The color will change in as little as 10 minutes. Size (mm): 40 x 119 Discoloration Humidity (%RH): 10, 20, 30, 40, 50, 60 (6 points) Quantity: 1 bag (200 sheets) Material: Blotting paper Color change: Blue to pink