Humidity Monitor Instrument case humidifier safely releases moisture evenly to eliminate warping, shrinking, and cracking Case holster comes with a strong adhesive to stick in the case Innovative Humid-I-Bar sponge holds 10x its weight in water and features anti-drip, no-mess material that safely releases moisture Accurate sensor measures humidity and temperature every 20 seconds HumiReader Hygrometer some with Case Holster to securely use in instrument case