Santacary XAR-P10 Quantum PAR light meter is designed to measure PAR flux which is quantified as Photosynthetic Photon Flux Density (PPFD), the sum of photons in units of micromoles per square meter per second (μmol/m2/s). XAR-P10 also measure Daily total PPFD. Daily total PPFD is typically reported in units of moles of photons per square meter per day (mol/m2/d) and is often called Daily Light Integral (DLI). In scan mode, users move the light meter steadily and fluidly under the area for which users desire an average light reading. The meter will display the average light reading from the duration of the scan. The XAR-P10 Quantum PAR light meter consists of a handheld meter and a dedicated quantum sensor that is connected by cable to aluminum housing. Sensor consists of an acrylic diffuser (filter), and photodiode. To accurately measure PFFD incident on a horizontal surface, the leveling plate under the sensor is to ensure the sensor is level. The bubble-level in the plate makes leveling simple and accurate. Typical applications include measurement of incident PPFD on plant canopies in outdoor environments or in greenhouses and growth chambers, and reflected or under-canopy (transmitted) PPFD measurement in the same environments. XAR-P10 is ideal for gardeners, agronomy application measuring PPFD. PAR Specification: Measuring Range 0 to 4000 μmol/m2/s Spectral Range 400-700 nm Sensitivity 1 μmol/m2/s Response Time <1s (99%) Temperature Correlation Max. 0.05%/°C Cosine Correction Incident angleUp to 80° incident angle Meter Dimensions75x165x25 mm (2.95x6.49x0.98”) Sensor Dimensions 50 mm (1.97”) diameter; 30 mm (1.18”) height Weight233 grams (8.22 oz.) without batteries MATERIALS SUPPLIED: Santacary XAR-P10 Quantum PAR Light Meter; Plastic Toolbox; Telescopic Wand with Tripod; English User Manual.