Extech HT30 Heat Stress WBGT Meter

Amazon

Auto power off with override Built-in RS-232 interface with optional PC software In/out function displays the WGBT value with or without direct sun exposure Black globe temp monitors the effects of direct solar radiation on an exposed surface 0-100% RH, Weight: 0.3086471668 Pounds, Manufacturer: Extech

Test-meter.co.uk

Advanced WBGT Index Meter measuring heat stress via temperature, humidity, air movement & radiant heat. Black Globe Temperature mode. RS232 interface. °F/°C units. In/Out function. Battery included.