Leaf Wetness Sensor uses a capacitive grid sensor for better accuracy than resistive grid-based sensors. Measurement range: 0 (dry) to 100% (wet). Resolution: 0.59%. Includes a mounting bracket so you can position Sensor to mimic the wet-dry characteristics of the plants being studied. Note: A Light-Sensor Bracket (No. 89559) and Light-Sensor Level (No. 89560), sold separately, are recommended.