Kestrel Instruments Support & FAQs

Why am I getting *** for my black globe readings?

First, make sure the unit is ON. The Kestrel must be ON in order to record any measurements related to Globe Temperature(TWL, WBGT, TnWB). If your unit is ON and you are still reading *** on the Kestrel measurement screen, there may be an issue with your black globe, and it may need to come in for repair. Contact us at or 1-800-784-4221.