Final answer:
WBGT Kits are placed in use when the ambient temperature exceeds 75° in accordance with TR 350-29a.
Step-by-step explanation:
The question is asking about the use of WBGT (Wet Bulb Globe Temperature) Kits in relation to ambient temperature. WBGT Kits are used to measure the combined effects of temperature, humidity, and radiant heat on the human body.
According to TR 350-29a, these kits will be placed in use when the ambient temperature exceeds 75°. Therefore, the correct answer is a) True.