Check your plant health with this simple Soil pH tester. 3 in 1 solution. It tests water moisture, light, pH and analyses humidity. Perfect for any indoor and outdoor usage. The double probe design offers a fast accurate measurement. It's easy to use, simply insert the probe tip into the root level for best reading and keep clean after use. No power required. Size: 17.8cm Please allow 1-2cm measuring deviation due to manual measurement.