iBebot
The AirComfort temperature and humidity sensor: a small wireless sensor that reports the tent's climate to your phone and keeps a history.
Pre-OrderiBebot
AirComfort Temp & Humidity Sensor
£26.96
About iBebot
Using it
At canopy height, out of the direct light. Watch the lights-off swing: that is where most humidity problems start.
Related
The ThermoPro TP358 and other meters are under Hygrometers.