Barometer Thermometer Hygrometer Gauge is an SSI India product in the Meteorology Earth Science & Solar System category. Key specifications include SKU: SSI-PHY-MESS-49. Hygrometer Scale 0-100, Resolution: 2%, Barometer Scale: 28-31 IN Hg & 930-1050 hPa, Resolution: 0.1 IN Hg & 0.2 hPa, Thermometer Scale: -30°C to 50°C, -20F to