... after each use, do not use in soil with stones and insert forcibly.Specifications:Name: 4 in 1 Soil Survey InstrumentType: AMT-300Test object ... ) LOW-, LOW, LOW+, NOR-, NOR, NOR+,HGH-, HGH, HGH+Moisture(5 levels): DRY+, DRY, NOR, WET, WET+PH value(12 levels ... off: The unit will be automatically off after 5 minutes disabling.Operating temperature: +5°C~+40°CSize: Main unit 122cm x 63cm ...