Features: - :Ambient light: 9 LEVELSoil PH: 3.5 - 9Temperature: - 9 - 50C (16 - 122F)Moisture: 5 LEVELSize: 12.5in * 2.3 in*1.7inincrements: 0.5How to use this soil tester?Step 1: Take off the red cover in the end of the probe, and turn on the tester.Step 2: Stick the probes into the soil 3 - 5 inchesStep 3: Adjust the position of the probes until the tester is fixed in the soil to be tested.Step 4: Read the data of Moisture/pH/Light Level/Temperature in the dial about 10s. Push the switch at the back to pH or position as needed.Step 5: Remove probes from soil and wipe clean after each use.Note:DO NOT put the item in the liquid to test.Please note that when measuring the light, do not block the light sensor on the top of the meter.If the soil is too dry and can't get the PH values, please pour some water and test again after 30 mins.