Photodiode hand held chlorophyll meter Spad 502 Plus

Product description Spad 502 Plus Chlorophyll Meter can quickly measure chlorophyll content or “greenness” of different plants to reduce the risk of yield-limiting deficiencies or costly overfertilizing. This Chlorophyll Meter quantifies small changes or trends in plant health long before being visible to the human eye. Non-invasive measurement.Measured datum will be displayed in trend graph. It can be used to enhance the utilization rate of nitrogen fertilizer. Technical parameters Measuring mode: 2 wavelengths optical density difference Measuring area: 2 mm×3 mm Sensor: Silicon semiconductor photodiode Display mode: LCD, 4 decimal places, tendency chart Measuring range: -9.9 to 199.9 SPAD units Memory capacity: 30datum, automatically calculate and display average value Power: 2 AA batteries (1.5V) Battery life: More than 20,000 times Test interval: 2s Accuracy: Within ±1.0 SPAD units (for SPAD value between 0 and 50 under normal temperature) Repeatability: Within ±0.3 SPAD units (for SPAD value between 0 and 50) Reproducibility: Within ±0.5 SPAD units (for SPAD value between 0 and 50) Working environment: 0-50°C Other functions: alarm; calibration Weight: 255G Size: 164*78*49CM