Accuracy: 0.2ph-suitable for agricultural field and educational experiments. The accuracy of pH 8?electronic uses the field effect of the earth on two different metals; the probe is 30.5?cm long for more large flower pots. This meter can measure pH and moisture at depths up to 30.5?cm. No batteries are needed. With special magnetic steel head, this pH tester guarantees the stability of measurement Use: to measure the pH and moisture value of different types of soil. Using tips: step 1?: Switch moisture/PH/light position. step 2?: stick the probe into the soil about 2-10.2?cm. step 3?: adjust the position of the probe until the pointer on the dial swings slightly. step 4? step 4: after 10 minutes, note the moisture/PH/light level in the dial. step 5: remove the probe into the soil and wipe clean after each use. speciation?: Soil pH meter technical parameters: pH range? PH 3-8?; Moisture range? 1-80% pH accuracy?: 0.2?pH?; Humidity accuracy? 1% Ambient temperature? 5-50?C measurable depth? 6?cm Size? 5?x 16.5?cm/5?x 16.5?cm (approx.) Package Contents: 1?x moisture monitor pH meter from the ground