For indoor use. Bench or wall-mounting, with three, 45mm diameter dials. From top to bottom these indicate humidity (scaled 0 to 100% RH), atmospheric pressure (scaled 970 to 1050hPa x 1hPa) and temperature (scaled -20 to +60°C), respectively. Overall 55 x 33 x 165mm W x D x H. Weight 116g.