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.

  • Product Name:Chlorophyll Meter
  • Item No.:SPAD 502 Plus
  • Manufacturers:Spectrum
  • Country of Origin:USA

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 SpecMaps™ online web-mapping application


*    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