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

What is it?

atLEAF CHL BLUE is a powerful, handheld, easy to use device with USB and Bluetooth connections 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 BLUE 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)

    Keys 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)


    6.2oz (175g), not including batteries


    USB with software for Windows (atLEAFSoft version 1.26 or greater)

    Bluetooth Low Energy (BLE) with free   Mobile atLEAF App

    Current mobile devices are commonly released with hardware and software support for Bluetooth Low Energy. Check if your mobile supports Bluetooth LE. (**)
    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)

    (*) atLEAF App allows to sync date & time on device and to download temperature associated with measure, while atLEAFSoft PRO software is required to sync the device time with PC time and to transfer the measurement temperature to PC

    Download atLEAF CHL BLUE flyer

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

    atLEAF App

    Download for free the atLEAF App to see commands and functions available on it.

    atLEAF App for Android atLEAF App for Apple iOS

    Following is a list of some available functions:

  • Bluetooth
  • Connect device
  • Disconnect device
  • Get device info
  • Download names from device
  • Get device time
  • Set device time
  • Manage measures
  • Define Measure groups
  • Group characteristics
  • Group Description
  • Field area definition
  • Plant population
  • Define Measure names
  • View measures data
  • View measures on map
  • View measures chart
  • Statistics
  • DO Measure
  • Conversions & Formulas
  • Unit converter
  • Seeding and Planting
  • Map & Weather
  • Map
  • Wheater
  • Forecast
  • Settings

  • When measures are performed remotely through the mobile, they are stored on the mobile storage area. Depending both on the mobile features and on the app settings they can be stored with the following values:

  • CHL measure value
  • atLEAF device temperature
  • measure name selected on mobile
  • latitude and longitude coordinates of the mobile

  • By enabling a setting on the app, the remotely performed measures can also be stored on the atLEAF CHL BLUE device as: CHL measure value, temperature and device time. These values can be downloaded through USB to a PC with the atLEAFSoft software (*).

    App screenshots

    atLEAF free mobile screenshots App 1/4 atLEAF free mobile screenshots App 2/4

    atLEAF free mobile screenshots App 3/4 atLEAF free mobile screenshots App 4/4
    atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1 atLEAF free mobile screenshot 1

    Android 10 and later require to enable location permission to scan Bluetooth BLE devices

    Known issue for atLEAF CHL BLUE Ver 1.2:

    (**) Few Samsung models when running on Android 10 fail to pair with atLEAF CHL BLUE meter through Bluetooth connection (see e.g. forum.developer.samsung.com).
    To solve this issue update the latest Android version or contact our support.

    The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by FT GREEN LLC is under license. Other trademarks and trade names are those of their respective owners.