plant chlorophyll meter, leaf sensor
atLEAF® CHL STD chlorophyll meter

What is it?

atLEAF CHL STD is a powerful, handheld, easy to use device for noninvasively measuring the relative chlorophyll content of green leaf plants. Chlorophyll content can be an indicator of the plant’s condition.

How does it work?

Plant relative chlorophyll concentration is measured by inserting a leaf into the device aperture. Green leaves of up to 0.1 inch (3mm) thickness can be measured. It only takes one press of the key to perform a basic measurement.

By utilizing the four atLEAF CHL STD keys you can:

  • view up to 64 measurements stored in the device’s memory
  • delete the most recently performed measurement
  • delete all measurements
  • perform instrument calibration

  • Specifications

    Measuring System

    Optical density difference at 2 wavelengths (640nm and 940nm)


    4 keys to operate all functions; simple, one-key operation to perform measurements only


    2 lines x 16 characters

    Data Memory Capacity

    64 measurements

    Power Source

    2 AA (1.5V) batteries

    Battery Life

    5,000-30,000 measures, depending on use and batteries type

    Time to perform a measure

    Less than 1 sec

    Dimensions (W x D x H)

    6.9 x 2 x 1.8 inches (175 x 50 x 45 mm)


    5.8oz (165g), not including batteries

    Auto power off

    after 1 minute of inactivity

    Download atLEAF CHL STD flyer

    Each atLEAF device is assembled, tested and calibrated in the United States.