Soil Moisture Meter, Foneso Soil Water Monitor, plant moisture meter, Hydrometer for Gardening, Farming, (No Battery needed, 2 Pack) Measure soil's moisture content by just plugging in the probe, no batteries needed. Easy to read moisture levels Color coded reading system, from red, green to blue Length is 27.5 cm (10.8 inch), easy to carry Widely applied in soil moisture sensor in your gardening, farming, or potted plants