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Features: - battery is no need. - Could test soil ph soil fertility suggest to use indoors or outdoors convenient to use, simple to operate, solid quality accurate results Specifications: material: plastic soil ph measurement range: about 3. 0 - 10. 0 ph accuracy: about ±0. 25 ph(20?)±0. 2 ph (suitable for farm or education experiments) soil moisture test range: about 0-10 working temperature: about 0 - 50°c(32-122°f) calibration: manual point 1 measurements: about 30cm/11. 81" x 5cm/1. 97" length of probe: about 20cm/7. 87" How to Use: Step 1: Switch to moisture/pH/light position according to demand . Step 2: Insert 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: Check moisture/pH/light level in the dial after 10 minutes . Step 5: Remove probe from soil and wipe clean after each use . Kindly Note: 1. Do not force it into very hard soil or touch hard objects since it will be easy to damage the probe . 2. Do not use it to test pure water or other liquids. It can only be used to measure soil . 3. Do not leave the meter in the soil for a long time . 4. Please wipe and clean the probe after each use . 5. If the soil is too dry the indicator will not move, and water it before testing.