Extech HT30-NISTL with Limited NIST Certificate

• Heat Stress Index 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 solarradiation on an exposed surface
• Air Temperature (TA) plus Relative Humidity (RH)
• Selectable units of °F and °C
• In/Out Function displays the WGBT value with or without direct sun exposure
• Auto Power Off with override
• Built-in RS-232 interface with optional Windows® compatible software

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Each Unit Includes

• Limited NIST Certification
• Two AAA batteries