Windscribe have a free product called control-d DNS which works like pihole but you don’t have to manage it yourself. Just set your router or PC DNS to point to the controld DNS server that suits what you want filtered.

Ohchr.org daily reports

Yes they work well. No batteries needed. They give clear indication of dry/moist/soggy. I was over-watering and killing plants before I bought one.

A soil moisture measuring device to tell when plants need watering. 2 for $10 on amazon.