1.【2-in-1 function】 Test soil pH value of plant ,quickly helps you specialize in grasping when you need to water your plant, control the pH value in the soil.2.【Accurate and reliable】 Premium Double-needle Detection Technology strongly enhances the speed and accuracy of detecting and analyzing soil pH acidity, refuse to be a killer of plants, promote plant growth in a healthy way.3.【Easy to use】 Just insert the sensor probe into the soil about 15cm, toggle switch to test pH value, fertlity you would like to measure, then wait for a few minutes till the pointer stops swinging to get a stable reading on the scale dial. If the plant is very dry, the soil pointer will not swing, that means your plant needs water.4.【COMPACT FOR INDOOR & OUTDOOR USE】: Portable and easy to carry to anywhere you want .Know when to water, adjust pH, or change lighting for your flowers, plants .Refuse to be a killer of plants, promote your plant growing in home , garden, lawn or farm etc.5.【No Battery Needed】 No batteries or electricity needed, ready to use out of box. Plug and read.