SpotOn Quantum Par Meter A reasonably priced metre that measures Photosynthetic Active Radiation (PAR) light under any light source, including LEDs!Provides accurate PAR light readings from any source of light.- In or outside, full sun to full shade.- Synthetic lighting (LED, HPS, Metal Halide, Florescent, Halogen, etc.).THREE MODES OF OPERATION: - For PAR light readings, use the Instant Spot Measurement mode.- Scan mode for speedy area-wide averages of PAR.- The LCD in DLI mode displays the Daily Light Integral (no computer needed).SMALL AND SIMPLE TO USE.IMPACT AND WATER RESISTANT.STAND, STAKE, LANYARD & HANGER HOLE, AND MAGNET MOUNTS INTEGRAL MOUNTING PLATE.FOR MOUNTING ON CAMERA TRIPODS AND STANDS, 1/4-20 THREADED HOLE.INCLUDES A SOFT CARRYING CASE AND A SENSOR COVER. QUANTUM PAR LIGHT METER SPECS: Range: PAR LIGHT:0.0 to 6,500 μmol m-2 s-1DLI (Daily Light Integral):0.0 to 560.0 moles m-2 day-1 Display Resolution: PAR Light:0.1 μmol m-2 s-1 from 0.0 to 99.91 μmol m-2 s-1 from 100 to 6,500DLI:0.1 moles m-2 day-1 Accuracy: +/- 5% (each meter is calibrated to a NIST traceable light sensor on a broad-spectrum light source) Azimuth Error: +/- 1% over 360° Daily Light Integral (DLI): Calculated continuously from light readings every 3 minutes Water Resistant: IP-65 rated for use in rain, irrigation, and condensing environments (do not submerge) Operating Environment: 32-130°F(0-55°C) with 0-100% RH condensing ok Battery: CR2032 3v coin cell lithium included (2-year battery life) Size & Weight: 1.75in(4.5cm)W x 5.75in(14.6cm)L x .85in(1.8cm)D0.17lb(77g) Response Data: Spectral Response