Power Supply Self-powered Output (Sensitivity) 0.01 mV per µmol mˉ² sˉ¹ Calibration Factor (Reciprocal of Sensitivty) 100 µmol mˉ² sˉ¹ per mV Calibration Uncertainty ± 5 % Calibrated Output Range 0 to 40 mV Measurement Range 0 to 4000 µmol mˉ² sˉ¹ Measurement Repeatability Less than 0.5 % Long-term Drift Less than 2 % per year Non-linearity Less than 1 % (up to 4000 µmol mˉ² sˉ¹) Response Time Less than 1 ms Field of View 180˚ Spectral Range 389 to 692 nm ± 5 nm (wavelegths where response is greater than 50 % of maximum) Spectral Selectivity Less than 10 % from 412 to 682 nm ± 5 nm Directional (Cosine) Response ± 5 % at 75˚ zenith angle Azimuth Error Less than 0.5 % Tilt Error Less than 0.5 % Temperature Response -0.11 ± 0.04 % per C Uncertainty in Daily Total Less than 5 % Detector Blue-enhanced silicon photodiode Housing Anodized aluminum body with acrylic diffuser IP Rating IP68 Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m Dimensions 24 mm diameter, 37 mm height Mass (with 5 m of cable) 100 g Communication Protocol Bluetooth® Low Energy (Bluetooth 4.0+) Bluetooth Range ~45 m (line-of-sight) Data Logging Capability Averaging Interval: 1-60 minutes; Sampling Interval: ≥ 1 second Data Log Capacity Over 400,000 Entries (~9 months at a 1-minute logging interval) Time Accuracy ± 30 seconds per month at 0° C ~ 70° C Battery Type 2/3 AA 3.6 Volt Lithium Battery Battery Life ~1 year w/ 10-second sampling interval and an average of 5 minutes daily connected time; ~2 years w/ 60-second sampling interval and an average of 5 minutes daily connected time Operating Environment -40 to 85 C Dimensions 66 mm length, 50 mm width, 18 mm height Weight 52 g IP Rating IP67 Connector Type M8 Bluetooth Module BMD-340 Contains FCC ID: 2AA9B10 IC: 12208A-10 ADC Resolution 24 bits Warranty 4 years against defects in materials and workmanship Manufactured Assembled in the USA