This precise, high quality meter accurately measures relative moisture content incrementally from 1 (dry) to 10 (saturated) at root level in just 60 seconds. Use this meter to determine when plants are nearing their water stress point or develop scales of drought tolerance using different plants. Measure and graph moisture ﬂuctuations with different compost mixtures to optimize composting. The 8" probe is also practical for avoiding over (or under) watering of house or garden plants. No batteries required; includes instructions.