http://www.channeleco.com/en/Item/Show.asp?m=1&d=1197
Product description: QT-AT 502 Chlorophyll Meter can measure chlorophyll content of plants. Chlorophyll content is an important index of plant growth. This instrument is powerful, portable, and easy to use. It does no harm to plants. Users just need to put a leaf tissue larger than 3mm in the aperture, and then press the button to get the chlorophyll content reading.

Features:
· The measurements can be designated to up to 500 plant names;
· With a storage of 5000 data;
· Be able to delete recent or all of the data
· Designated plant names can be uploaded to the instrument from a computer and data can be downloaded to a computer via USB interface.
Specifications
Measurement System
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Optical Density Difference between wavelength of 650 nm and 940 nm
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Measurement Range
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0 to 99.9 SPAD
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Precision
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Standard Deviation less than 1
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Button
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4 buttons, one is for measurement
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Display
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2 lines x 16 characters
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Data Storage
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5000 data, including data with designated plant names; The name is up to 32 characters (only only 28 characters shown);
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Power Source
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2 AA 1.5V batteries
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Battery Life
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5,000-30,000 measurements per set of 2 batteries, depending on the usage and battery type;
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Measurement Time
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Less than 1 second;
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Dimension
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164 x 78 x 49mm (W×H×D);
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Weight
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225g (without batteries);
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Interface
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USB
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Automatic Shutdown
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1 minute without operations (10 minutes with USB connection)
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Software:
The software can upload designated plant names to the instrument, also the data can be downloaded to the computer via USB interface. The software can run successfully under Windows 2000/XP/Vista system.
ORIGIN: CHINA
Channel Technology Group Limited
Tel:+86-10-62111044
Fax:+86-10-62114847
Web:http://www.channeleco.com/en/
Email:repair@qudao.com.cn
bio-equip.cn
For the purpose of introduction and promotion of global advanced instrumentation and technology in the fields of terrestrial ecology, aquatic ecology and life science, Channel Technology Group Limited was established in 2001.
Channel now employs over 70 staff with a wide spectrum of expertise, so as to offer world-class total solution to customers. With sheer dedication and commitment from our staffs, Channel has evolved rapidly from a pure distributor of environment testing products to a total solution provider in all aspects of ecology, water and life science testing products. We offer in-house expertise in sales, installation, repairs & maintenance, training, technical consultation & testing support. As well, a calibration centre has been set up to provide professional services to our customers.