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

What is it?

atLEAF CHL PLUS 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 PLUS keys you can:

  • assign species names to the measurements; device can store up to 490 names
  • view up to 9,554 measurements stored in the device’s memory
  • delete the most recently performed measurement
  • delete all measurements
  • transfer plant names to the device or measurements to a computer using the USB mode
  • display sensor temperature in °F and °C
  • display time (*)
  • perform and show average on selectable number of stored measurements

  • Each performed measure has associated device time and sensor temperature (*).


    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

    9,554 measurements composed by value and associated species name, time and temperature (*);
    490 names up to 32 characters long (28 characters displayed)

    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


    USB with software for Windows

    Auto power off

    after 1 minute of inactivity (4 minutes in USB mode)

    Display language

    The device display language can be changed with atLEAFSoft PRO (see more)

    (*) atLEAFSoft PRO software is required to sync the device time with PC time and to transfer the measurement temperature to PC

    Download atLEAF CHL PLUS flyer

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