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☞ The probe is 12 inches long for extra wide plants. ☞ Use: for measuring pH value and moisture of different types of soil. ☞ This device can measure the pH value and moisture up to a depth of 12 inches. No batteries required. ☞ Accuracy: ± 0.2ph suitable for country and classroom experience. ☞ The precise pH 8 uses the electronic earth effect of the earth on two different metals