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MQ-210 Underwater Quantum Meter

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  • Apogee Instruments MQ-210 Underwater Quantum Meter
  • Original quantum sensor
  • Original quantum sensor-back

Product Description

The MQ-210 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 salt water aquariums where corals are grown. Note: The handheld meter is not waterproof, only the sensor and cable are waterproof.

The 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.


Specification Sheets
Technical Information
Technical Drawings
Technical Information


Articles Featuring Apogee's Underwater Quantum Meters

Apogee MQ-510 Is The First Truly Underwater PAR Meter For Hobbyists - Jake Adams, Reef Builders

Dana Riddle Reviews the Apogee MQ-500 Quantum (PAR) Meter - Dana Riddle, Advanced Aquarist


Apogee Instruments Meter User Guide


Calibration Uncertainty
± 5 %
Measurement Repeatability
Less than 1 %
Long-term Drif (Non-stability)
Less than 2 % per year
Response Time
Less than 1 ms
Field of View
Spectral Range
410 to 655 nm
Directional (Cosine) Response
± 5 % at 75° zenith angle
Temperature Response
0.06 ± 0.06% 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; seperate 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; 28 mm height
2 m of two conductor, shielded, twisted-pair wire; additianal cable available; santoprene rubber jacket ( high water resistance, high UV stability, flexibility in cold conditions)

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