Where should the digital thermometer readout and sensor be placed inside a tent

I'm noticing as much as a 12 degree F difference depending on whether the readout of the digital thermometer is in the shade or in the direct light. The sensor is hanging where the tops of the plants are, and has been fixed in that position. I'm guessing I need to keep the sensor in direct light and the readout in the shade, if anyone knows for sure that would be appreciated.

if there's that much of a difference in the temperatures then you need to add air circulation until the ambient temperature is consistent

I put it at the top of the canopy even tho moving alot of air.