Sensors and digital probes, with Sigfox connectivity, for accurate measurement of volumetric water content in soil and temperature, as well as other parameters, to decide irrigation strategies, and save water, energy and fertilizers, availability of live information of the state of crops, in our web domain. Our bi-directional digital probe MT300C is the only one in the world with the capacity to send messages, humidity and temperature of the ground, being totally buried, being able to install up to three probes at different depths and having the information of the soil profile. Possibility of 4 different calibrations, according to the texture of the floor. Long duration of batteries, rechargeable. Agriculture, Greenhouse, Golf, Gardening, Green Covers, Vertical Gardening, Smart Cities.