Description The WBGT-2010SD Wet Bulb Globe Temperature (WBGT) measurement considers the effects of temperature, humidity and direct or radiant sunlight. It can also determine Heat Stress Index which measures how hot it feels when humidity is combined with temperature, air movement, and radiant heat. Black Globe Temperature (TG) monitors the effects of direct solar radiation on an exposed surface. An in/out function displays the WGBT value with or without direct sun exposure. Real time SD memory card Datalogger, it Built-in Clock and Calendar, real time data recorder, sampling time set from 1 second to 3600 seconds. RS232/USB PC COMPUTER interface. Power by UM3/AA ( 1.5 V ) x 6 batteries or DC 9V adapter. Dimension: 177 x 168 x 45 mm ball Round, 75 mm dia Weight: 489 g