3 in 1 Garden Soil Analysis Tester Hygrometer Acidity PH Light Test Moisture Range: 1~100% RH . pH Range: 3.5~8 pH . Light Range: 0~2000 . Size: 290 * 50 * 38mm . Probe length: 200mm . Weight: 90g . Features: . 3-in-1 feature includes: testing your soil value, soil moisture level, and sunlight level . Keep houseplants, trees and crops healthy . This accurate 3-in-1 moisture meter gives instant results, allowing you to choose the proper soil amendments . No batteries required . Made of analog display, it is durable to use . Soil pH: . Soil pH also known as "soil reaction". It is the soil solution of acid-base reaction. Depends mainly on the concentration of hydrogen ions in the soil solution to said pH value. Solution pH = 7 neutral solution; pH of less than 7, the reaction is acidic; pH greater than 7 is alkaline. Soil pH can generally be divided into the following levels: . &lt;4.5 strong acid . 4.5-5.5 strongly acidic . 5.5-6.5 acid . 6.5-7.5 neutral . 7.5-8.5 alkaline . 8.5-9.5 strongly alkaline . Package included: 1 X 3 in 1 Garden Soil Analysis Tester