The key specifications of the HMI Unit 4" Display are — Operating Temp.: 0 to 50?C; Storage Temp: -20 to 80?C; Humi: 10% to 85% ( Non Condensing); Type of LCD: TFT colour touch screen. These specifications are based on the standard GEM Equipments design; always verify against your machine's requirement before use. GEM Equipments Pvt. Ltd. is an ISO 9001:2015 certified, India-based manufacturer (since 1984) of compressed air dryers, cooling towers, industrial chillers, and compressed air treatment accessories, headquartered in Coimbatore, Tamil Nadu.