Humidity indicator cards

3 spots (30-40-50%), indicator spots change from brown (dry) to yellow (humid).

3 spots (5-10-15%), indicator spots change from brown (dry) to yellow (humid).

3 spots (5-10-60%), indicator spots change from brown (dry) to yellow (humid).

6 spots (10-20-30-40-50-60%), indicator spots change from brown (dry) to yellow (humid).