Silverline 3 in 1 Soil Tester 210mm

Amazon

3-way selector switch for moisture, light and pH levels Measures moisture at root level and tests acid/alkaline levels in soil Easy-to-read dial gauge Ideal for gardens, lawns and greenhouses Helps to prevent overwatering and root rot, Weight: 0.1984160358 Pounds, Manufacturer: Silverline

Electrical World

Solar-powered soil tester, invaluable for gardeners to determine pH levels (acid/alkaline) and moisture content of the soil, as well as light intensity. Easy-to-read dial gauge and 3-way mode selector switch. 2 x 210mm long probes. Helps to prevent overwatering and root rot.