PLANT METER 'GREEN HOUSE' 2 IN 1The 2 in 1 Greenhouse Soil Fertility meter is a must have for all gardeners! First, this device tests the soil fertility value for nutrients required for plant growth! Unsure if you need to add compost manure, or other soil enhancements? This device will let you know in as little as 45 seconds! Second, the meter checks the pH value of the soil, which is super helpful when planting flowers and shrubs with specific pH requirements.