The Hydrofarm Active Eye Analog Light Meter is used to identify best light level of healthy plants. Easy to use hand-held design. Get precise reading with three scales.
Includes instructions and "Consumer's Guide to Light Gardening" brochure. Lifetime silicon sensor - no batteries required. Reads up to 5000 foot candles of sun, high intensity, or fluorescent light. Exclusive "Zero" calibration feature - accurate to 2%.