Do you know any manufacturers of hardware pluggable into cell phones USB port to sense radiation, light, vibration, heat, humidity, rpm... ?

 

Doubtful you are going to get that in one device.

Most cellphones can already sense vibration and light.

https://blog.bluetooth.com/track-environmental-radiation-exposure-with-bluetooth-sensor
https://www.ebay.ca/sch/sis.html?_n...ith+Bluetooth+Smart+and+ANT+Plus+Connectivity
https://www.amazon.com/DAddario-Humiditrak-Bluetooth-Humidity-Temperature/dp/B019JD0XZ0

Took me all but 30 seconds to search for these.

 

Yes I do know of some..
Quite a few actually..