An affordable meter that provides scientifically accurate Photosynthetic Active Radiation (PAR) light readings under any light source including LED! Provides accurate PAR light readings from ANY light source: – Full sun to full shade indoors or outdoors. – Artificial light sources (LED, High Pressure Sodium, Metal Halide, Florescent, Halogen…) Three modes of operation: – Instant Spot Measurement mode for PAR light readings. – Scan mode for quickly averaging PAR over an area. – DLI mode shows Daily Light Integral on the LCD (no computer needed). Compact and easy to use. Water and impact resistant. Integral mounting plate for: stand, stake, lanyard & hanger hole, and magnet mounts. 1/4-20 threaded hole for mounting on camera tripods and stands. Includes a sensor cover and soft carrying case. OPTIONAL: Add on extension wand allowing you to reach deep into or across the canopy! Range: PAR LIGHT: 0.0 to 6,500 μmol m-2 s-1 DLI (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 99.9 1 μmol m-2 s-1 from 100 to 6,500 DLI: 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)D 0.17lb(77g) Response Data: Spectral Response Cosine Response