Water Meter Probe for Indoor/Outdoor Plant Water Monitoring. Great Gift for Gardeners. Can Measure Different Depths. Instructions in English, Spanish and French.meter Makes a Great Stocking Stuffer No wires or batteries needed. Push Probe into soil at mid-root to determine moisture level. Moisture Meter shows if soil is Dry, Moist or Wet in 10 graduations. Probe is 8" long.Do not leave in the soil. Wipe off after use. Keep one handy indoors and another for convenient outdoor use.