SPECTRUM SPAD 502 Plus Chlorophyll Meter Model: 2900P / 2900PDL

Product Features:

The SPAD 502 Plus Chlorophyll Meter instantly measures chlorophyll content or “greenness” of your plants to reduce the risk of yield-limiting deficiencies or costly overfertilizing. The SPAD 502 Plus quantifies subtle changes or trends in plant health long before they’re visible to the human eye. Non-invasive measurement; simply clamp the meter over leafy tissue, and receive an indexed chlorophyll content reading (-9.9 to 199.9) in less than 2 seconds. Assess nitrogen needs by comparing in-field SPAD readings to university guidelines or to adequately fertilized reference strips. Research shows a strong correlation between SPAD measurements and leaf N content.

Specifications:

• Instantly measures chlorophyll content or “greenness” of your plants on a scale of -9.9 to 199.9

• Non-invasive, non-destructive measurement

• Trend graph stores and displays up to 30 measurements

• Waterproof design

• Includes hard carrying case and batteries

Configuration and composition:

• 2900P ─ Directly contact to measure plant leaf chlorophyll, no recording function.

• 2900PDL ─ Directly contact to measure green of green and record 4,096 measured values

Technical Data:

Measuring sample	Plant leaves
Measuring system	Optical Density Difference at two wavelengths: 650 nm and 940 nm
Measurement Area	2mm × 3mm
Maximum measuring thickness	1.2mm
Leaf depth	12mm, the depth slider is adjustable in the range of 0 ~ 6mm
Light Source	2 LEDs
SPAD Value	Index of relative chlorophyll content; -9.9 to 199.9
Minimum measurement time	Less than 2 seconds
Accuracy	Within ± 1 SPAD unit (when the SPAD value is between 0 and 50)
Repeatability	Within ±0.3 SPAD unit
Reproducibility	Within ± 0.5 SPAD unit (when SPAD value is 0 to 50)
Power Source2	AA alkaline batteries (1.5V)
Dimensions	78×164×49mm（W×H×D）
Weight	225g (excluding batteries)