This Air Current Test Kit is a quick and inexpensive way to help make these determinations. It works by creating a highly visible non-irritating dense white smoke that can be followed to determine the airflow direction.
Zefon Price: $97.50
The Testo PocketPro 410-2 Air Velocity, Temperature and Humidity Meter can be used to quickly measure air stratification and drafts, plus compare airflow quality against acceptable comfort guidelines.
Zefon Price: $199.00
The TMA10A is ideal for anyone who needs to measure wind flow and temperature in residential, commercial and industrial air conditioning systems.
Zefon Price: $204.95