Here's the first Moisture Meter designed specially for measuring moisture in orchid bark mixes. It's often tricky to determine if an orchid needs watering since the bark may feel dry on the surface but have plenty of moisture below. Simply insert the meter into the pot and one of 3 LED indicator lights will blink: Green for wet, Red for dry and Yellow for approaching dryness. This handy meter has a switch for bark or coir mixes, or soil or moss making it equally useful for orchids or other houseplants. Includes 2 AAA batteries.