MQ-200 Quantum Separate Sensor with Handheld PAR Meter - Apogee

MQ-200 Quantum Separate Sensor with Handheld Meter
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MQ-200 Quantum Separate Sensor with Handheld PAR Meter - Apogee

83% Recommend this to a friend (5 of 6)

SKU: 207794

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Quick Overview

Measure and store the PAR (photosynthetically active radiation) readings of your reef tank to ensure the healthy growth of your inhabitants.

  • Handheld meter with large, easy to read LCD display

  • Records reading for review

  • Record measurement in Automatic mode or Manually

  • Separate sensor head is fully potted, dome-shaped design - waterproof, weatherproof and self-cleaning


Full Details

Owners Manual


For Apogee Underwater PAR Measurement Correction Factors and Calculator - Click here


Quatum refers to the amount of energy carried by a photon. Apogee quantum sensors measure photosynthetically active radiation or photosynthetic photon flux (PPF). Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis.


Technical Specifications:

  • Cosine Response: 45° zenith angle: ± 1%, 75° zenith angle: ± 5%
  • Spectral Range: 409 to 659nm
  • Accuracy: ± 5%
  • Uniformity: ± 3%
  • Repeatability: ± 1%
  • Output: Integrated meter, 0 to 2999 µmol m-2 s-1
  • Responsivity: N/A
  • Calibration Factor: N/A
  • Electric or Sun Calibration: Electric and Sun
  • Response Time: Less than 1 second
  • Field of View: 180°
  • Long-Term Drift: Less than 2% per year
  • Number of Sensors: 1
  • Length of Sensor Bar: N/A
  • Power Requirement: 3 V coin cell battery (included)
  • Operating Environment: 32 to 122° F
  • Sensor Submersible:
  • Sensor: Yes, Meter: No
  • Meter Weight: 6.35 oz
  • Meter Dimensions: 4.5" Tall x 2.38" Wide x .56" Thick
  • 1 Year Manufacturer's Warranty


6 Items

  • Useless with most aquarium lighting, By Wendell on 9/22/2016

    The meter is not calibrated to measure underwater or for use with multiple types of artificial light. It was designed to measure sunlight as well as --SPECIFIC-- artificial lights (one at a time). The deviations are pretty big and you cannot use it to determine PAR on your tank.

    There are a set of conversions for different lights. Halide -3.7% (who knows what color bulb) , white LED lights -4.6% and another one for blue LED -12.7%, and several others (most have no wavelength). But, If you run multiple colors of LED lights or combination of different lights, like T5 and Halide, there will be no way to convert the numbers you see on your meter. You may be able to get a consistent reading, but it will not have much to do with PAR.

    If you plan to use it underwater, there are geometric and immersion effect correction factors to multiply, and a conversion calculator you can download. It is not a consistent number like 22%, it is a formula that you need the calculator for. You will need have your computer out so you can enter the meter reading, the water depth (in Meters) and distance from light source to get the corrected readings. Then you could go on to enter the correction factor of your lights if you are using straight Halide or specifically cool white fluorescent T5 bulbs.

    Remember that this meter will only measure PAR or PPFD, not spectrum. Your reading is for total light between 400 to 700 nm. It is not a useful tool to check your lights for spectrum shift from ageing, and is going to read incorrectly if you are not able to apply a color correction factor.

    The meter may be useful to you if you are working at a specific depth in an aquarium. You could move it left and right and get an idea of whether it is getting lighter or darker. Not really useful.
  • Get what you pay for By zega on 5/13/2015

    I am the lucky one having 2 Li-COR quantum sensor units, bunch of photospectrometers building kinetic flurimeters & stuff (check
    Now i compared it with Li-cor and i.e. when using 660 monochromatic light source (LED-actinic) or blue errors are huge exceeding 80%, it is calibrated for sunlight spot on, but for FL it is 10% off (i have done correlation for FL with LI190/LI-250 f(x)=0.904-5.94
    r^2 0.999
    for that reason i have printed spectral sensitivity curve and correlation and keep that in the box all the time.
    So spectraly it is meh 2-3stars, linearity is nice, it is small practical, looks good (better then Li-cor looks and functionality are great) waterproof (great)...
  • Very nice and compact By Reef&Frag on 12/10/2014

    I have been very happy with this unit. Very simple and easy to use. After watching some videos online it seemed like it worked better as a relative measurement than a precise reading. Overall very happy with my purchase.
  • Great for PAR By NE Patriots Fan on 4/2/2014

    Very good if you want to get serious about your lighting. This gives you great results and is easy to use. PAR is very important if you have a reef tank. This is a good meter to use to see where your lights stand. I bought one 8 year ago and still use it today.
  • Nice unit By Chicago on 3/25/2014

    I use this to track loss of light not necessarily the exact par. Works as described. Might want to research it's ability to read all blue led
  • Great product By ReefDVMs on 5/13/2013

    When switching over to LEDs and or moving coral via one system to another i have found this device to be very valuable, works well and waterproof sensor is prefect


Ask a question

Product Questions

Do you use sun or electric mode for a LED light I know the multiplier is 1.08
Question by: david scott on May 15, 2017 7:57:00 AM
Whenever taking readings from artificial light sources, you'll want to use the electrical light source setting.

Have a great day!
Answer by: Zack (Admin) on May 17, 2017 3:52:00 PM
I heard this thing does not measure correctly for LED lights. Is that true?
Question by: Derddy Dert on Dec 2, 2016 5:29:00 PM
Great question! There is a correction factor that requires more calculations for this PAR sensor. For more accurate PAR representations for LED lights, Apogee created the SQ-520. :-)
Answer by: Randy (Admin) on Dec 13, 2016 8:53:00 PM
Is the cord 6' in length?
Question by: Edward Bowman on Jun 11, 2015 12:32:00 AM
Great Question!
The cord is 2 meters long, slightly longer than 6'.
Answer by: Connor (Admin) on Jun 11, 2015 10:52:00 AM
What is the difference between a lux meter and a par meter ?
Question by: Brian Mullins on Mar 31, 2017 11:25:00 PM
Hey there,
Lux is a way of measuring light within the human visual range in a given area, and is not terribly useful for measuring the wavelengths that will benefit plants and corals for photosynthesis. PAR stands for Photosynthetically Active Radiation, and is encompasses the wavelengths knows to be useful for plant photosythesis.

Hope this helps!
Answer by: Zack (Admin) on Apr 6, 2017 12:15:00 PM