MQ-210X Original Underwater Quantum PAR Meter (OPEN BOX)

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The MQ-210X quantum meter is designed for underwater PAR measurements and already applies the sensor's immersion effect correction factor to the meter readings through firmware. The meter is excellent for all light sources, except LEDs, where post-measurement correction factors need to be applied to achieve accurate readings. The meter consists of a waterproof quantum sensor attached via waterproof cable to a handheld meter. The waterproof sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, anodized aluminum body with acrylic diffuser. The underwater quantum sensor is typically used in saltwater aquariums where corals are grown. 



  • Designed for underwater use
    • Auto-corrects for “immersion effect”
    • Waterproof quantum sensor and cable
    • Ideal for saltwater reef aquariums
  • Accurate, stable measurements (less than 2% long-term drift per year)
  • Datalogging capabilities - makes automatic measurements every 30 seconds and records 30-minute averages
  • NIST Traceable calibration


The MQ-210X meter has a sample and log mode, and will record an integrated daily total in mol m-2 d-1. Sample mode will record up to 99 manual measurements. Log mode will power the meter on/off to make a measurement every 30 seconds. Every 30 minutes the meter will average the sixty 30 second measurements and record the averaged value to memory. The meter can store up to 99 averages, once full it will start to overwrite the oldest measurement with new ones. An integrated daily total will be recorded from the 48 averaged measurements (making a 24 hr period). Sample and log measurements can be reviewed on the LCD display or by downloading the data to a computer, however, the integrated daily total can only be viewed by downloading the data to a computer. Downloading data to a computer requires the AC-100 communication cable (a standard USB cable will not work) and ApogeeAMS software.


Note: The handheld meter is not waterproof, only the sensor and cable are waterproof.




  • Calibration Uncertainty: ± 5%
  • Measurement Repeatability: Less than 1%
  • Long-term Drift (Non-stability): Less than 2 % per year
  • Non-linearity: Less than 1 % (up to 3000 µmol mˉ² sˉ¹)
  • Response Time: Less than 1 ms
  • Field of View: 180˚
  • Spectral Range: 370 to 650 nm
  • Directional (Cosine) Response: ± 5 % at 75˚ zenith angle
  • Temperature Response: -0.04 % per C
  • Operating Environment: 0 to 50 C; less than 90 % non-condensing relative humidity up to 30 C; less than 70 % non-condensing relative humidity from 30 to 50 C; separate sensor can be submerged in water up to depths of 30 m
  • Meter Dimensions: 126 mm length, 70 mm width, 24 mm height
  • Sensor Dimensions: 24 mm diameter, 33 mm height
  • Mass: 180g
  • Cable: 2 m of two conductor, shielded, twisted-pair wire with TPR jacket ( high water resistance, high UV stability, flexibility in cold conditions)
  • Warranty: 4 years against defects in materials and workmanship



What's Included?

  • 1x MQ-210 Handheld PAR Meter
  • 1x Waterproof Quantum Sensor
  • 1x Waterproof Cable
More Information
Manuals Product Manual
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