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1 Buy = 4 Hydrofarm Digital Light Meters!The LG17010 **Hydrofarm Digital Light Meter** is a precision instrument used to measure luminance (foot-candles). The meter is fully cosine corrected for the angular incidence of light, meaning that if you are not holding the sensor perfectly perpendicular to the light source, the sensor will still read the light correctly.The **Hydrofarm Digital Light Meter** sensor is stable and made of a long-life silicon photo diode. The digital light meter accurately measures to 5,000 FC. The meter?s built-in low battery indicator means you?ll never be caught by surprise by a low-power product. Buy Hydrofarm products from VMInnovations, an authorized dealer!