Sensitivity 0.2 mV per µmol mˉ² sˉ¹, 0.61 mV per W mˉ² Calibration Factor 5.0 µmol mˉ² sˉ¹ per mV, 1.65 W mˉ² per mV Calibration Uncertainty ± 10 % Measurement Repeatability Less than 1% Non-stability (Long-term Drift) Less than 3 % per year Non-linearity Less than 1 % (up to 300 µmol mˉ² sˉ¹) Response Time Less than 1 ms Field of View 180 ˚ Spectral Range 250 to 400 nm Directional (Cosine) Response ± 10 % at 75 ˚ zenith angle Temperature Response Approximately 0.1 % per C Operating Environment -40 to 70 C, 0 to 100 % relative humidity Dimensions 24 mm diameter, 28 mm height Mass 75 g (with 5 m of lead wire) Cable 5 m of shielded, twisted-pair wire with santoprene rubber jacket Warranty 4 years against defects in materials and workmanship