4 in 1 Digital LCD PH/TDS/EC/Temperature Water Quality Meter Tester Pen Backlit
It is very suitable for testing in the fields of water, swimming pool, aquarium, spa, hydroponic, food, wine and brewing. Accuracy: pH: +/- 0.01 pH; TDS/EC: +/- 2%; temperature: 0.5 ℃. For Raspberry Pi.