Four devices in one. Combined digital thermometer, hygrometer, pH meter and lux meter. The VT60 is designed to monitor all important conditions for healthy growth and development of plants of all kinds. It is inserted into the soil or other substrates such as coconut fiber, expanded clay (liapor, keramzit)... All measured values are shown on a clear LCD display. The thermometer measures and displays the temperature. The hygrometer measures and displays the soil moisture. The pH meter measures and displays the acidity or alkalinity of the soil. The lux meter measures and displays the light intensity on the plant, e.g. from sunlight or artificial lighting.