Heat Index Psychrometer - Compact Indoor/Outdoor Meter for Measuring up to 6 Environmental Parameters

Extech RH25 - Extech Instruments Corporation

Extech’s pocket-sized Heat Index Psychrometer Pen easily monitors Heat Index during hot humid days to prevent heat stroke during outdoor activities, sporting events or, indoor workplace. Its pen-sized design makes it convenient to fit into your pocket and carry it wherever you go. Complete with CR2032 battery.