3 in 1 Soil PH Tester Meter Garden Lawn Plant Farm Moisture Light Sensor Tools

Step 1: change humidity / pH / light position. PH range: 3.5-8ph (acid 3.5-7, alkali 7-8). Step 4: after 10 minutes, record the humidity / pH / light level on the dial. Humidity range: 1-10 (1-3 seconds, 3-7 nor, 7-10 wet).

eBay