Type : Handled meter for measuring chlorophyll using optical density difference at twowavelengths.Measurement sample : Crop leavesMeasurement system : Optical density difference at two wavelengthsMeasurement area : 2 x 3 mmLight Source : 2 LEDS (light – emitting diodes)Receptor : 1 SPD (silicon photodiode)Display : Measurement data : 3-digit LCD with decimal point.Data number : 2-digit LCDData Memory : Space for 30 data setsControls : Power switch, AVERAGE Key, ALL DATA DELETE key, ONE DATA DELETE key,and DATA RECALL keyPower source : 2 AA-size alkaline-manganese (1.5V) batteriesBattery line : More than 20,000 measurementsMinimum interval between measurements : Less than 2 seconds.Accuracy : Within ±1.0 SPAD unit (at room conditions, SPAD value between 0 and 50)Repeatability : Within ± 0.3 SPAD units (SPAD value between 0 and 50)Reproducibility : Within ±0.5 SPAD units (SPAD value between 0 and 50)Temperature drift : Less than ± 0.4 SPAD units/°CTemperature range : Operation : 0 to 50°C;Storage : - 20 to + 55°CDimensions 164 x 78 x 49 mm (6-7/16 x 3-1/16 x 1-15/16 in.)Weight : 225g (7-15/16 oz.) (not including batteries)Other