Q: Is there a maximum number of app downloads that will work with the probe? IE if there are X number of people in the lab with they all be able to download the app and use the one probe?
There can only be one BlueTooth enabled device that is connected to the 405i at one time.
However, there is no limit to how many devices can work with the 405i, they just all can't use it at once. It will only connect with one device.
Q: Does this meter come with a calibration certificate? Is it NIST?
The Testo 405i comes with a Certificate of Conformity. It does not come with a true calibration certificate.
The Testo 405i is not NIST calibrated. You can send it in to Testo to have it calibrated to NIST standards. Please call TruTech or Testo in order to set up a NIST calibration.
TruTech Tools- 1-888-224-3437