non-destructive to leaves. Measured datum will be displayed in trend graph. It can be used to enhance the utilization rate of nitrogen fertilizer.

Technical parameters

1.Measuring mode: Measuring area: 2 mm×3 mm

2.Sensor: Silicon semiconductor photodiode

3.Display mode: LCD, 4 decimal places, tendency chart Measuring range: -9.9 to 199.9 SPAD units

4.Memory capacity: 30datum, automatically calculate and display average value Power: 2 AA batteries (1.5V)

5.Battery life: More than 20,000 times Test interval: 2s

6.Accuracy: Within ±1.0 SPAD units (for SPAD value between 0 and 50 under normal temperature)

7.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

8.Other functions: alarm; calibration Weight: 0.8KG

9.Size: 23*19*11CM