Feature:The probe is 12" long for extra large planters.Usage: To measure the PH and Moisture value of different kinds of soil.This meter can measure pH and moisture at depths up to 12 inches. No batteries are required.Accuracy: ±0.2ph-suitable for agricultural field and classroom experiments.The Accurate pH 8 utilizes the electronic ground field effect of the earth on two dissimilar metals.Instructions:Step 1: Switch moisture/pH/light position.Step 2: Stick the probe into the soil about 2-4 inches.Step 3: Adjust the position of the probe until the pointer on the dial swing slightly.Step 4: After 10 minutes, Note moisture/pH/light level in the dial.Step 5: Remove probe from soil and wipe clean after each use.Speciation:Soil acidity meter technical parameters:PH range: 3-8 PH; moisture range: 1-80%PH accuracy: ±0.2PH; moisture accuracy: ±1%Ambient temperature: 5-50 ° CMeasurable depth: 6cmSize: 5 x 16.5cm / 1.97 x 6.50 inch (appr.)Package included:1 x Humidity Monitor Detector PH Soil MeterNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering..