The PWS I have is the Netamo Weather Station.
It uses one external sensor, this is on the shadey side of the garden, a rain gauge and indoor sensors which monitor temps, pressure, CO2 and noise levels (can tell when Mrs is sat watching telly or hovering)
I dont go to mad with it but I find it works for me and gives me more acurate weather than a app.
You can buy additional sensors.
There is an app which is on my phone and I can access via a comp on the tinterweb.