ขาย Moisture sensor for plant watering, humidity alarm. ราคาที่ดีที่สุด

moisture sensor for plant watering, humidity alarm. Description: This is an alarm from the plant - you just put it into the soil near the plant, and it will sound a little chirp on dry land remind you to water the plant. Using measurements of humidity vinegar compared to the measurement of relative humidity, which means it does not make contact with the ground electric avoid corrosion of the electrodes and the electrolyte acid soil and result. to be more precise and useful battery life. Has been paying special attention not to a trivial one - Sensors are silent on this dark and limit yourself from too much noise. The alerts can be set for each plant. When water is used by the plant to detect moisture levels are low and will start a short rare because water will evaporate more alarm rate increases. This sensor can detect if it is day or night, by measuring the amount of ambient light and do not make noise when dark.