GALLOPJOY Novelty Shining Attractive New Accurate Durable Portable Mini Humidity Useful Easily Clean This durable analog hygrometer is excellent for use in incubators, brooders, aviaries and cages. They are widely used in greenhouses and any other indoor / outdoor areas, or simply for home use. Humidity Range: 0% - 100%. Powered By: Power-Free. Its mini design can be placed to anywhere, and stand on the surface with its kick stand.