A second method which is simple and easy but less accurate then using a pH meter, consists of using certain indicators or dyes. Many dyes change color with an increase or decrease of pH making it ...

XLUX Soil Moisture Meter - See at Amazon Best color-changing: IPPINKA Sustee Aquameter - See at Amazon Best for outdoors: Netro Whisperer - See at Amazon Best for pH: Sonkir Soil Meter - See at ...