SPAD 502 Plus Chlorophyll Meter

SPAD 502 Plus Chlorophyll Meter

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.

• 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
• Compare in-field SPAD readings to university guidelines
• Research shows a strong correlation between SPAD measurements and leaf N content
• Available with or without a built-in data logger
• Includes hard carrying case and batteries

Data-logging model (2900PDL)

• Connects to any GPS receiver that has a serial output option*
• Equipped with internal data logger and RS-232 port
• Records 4,096 measurements (1,488 with added GPS/DGPS option)
• Configure and download meter with FieldScout® software and USB-to-3.5mm-Stereo-Plug Adapther (Item 3661U.(included)**
• Compatible with SpecConnect

*    GPS interface requires two cables.  The GPS/DGPS cable (item 2950CV5) is available from Spectrum. A PC serial interface cable supplied by the manufacturer of the GPS receiver is also required.
**    PC cable connects to a computer USB port.

Optical Density Difference at two wavelengths: 650 nm and 940 nm

Measurement Area: 2 mm x 3 mm  (Approximately 3/32 in x 1/8 in)

Light Source: 2 LEDs

Receptor: Silicon Photodiode

Power Source: 2 AA alkaline  batteries (1.5V)

Repeatability: Within ±0.3 SPAD unit

SPAD Value: Index of relative chlorophyll content; -9.9 to 199.9