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SQ-610-SS 400-750 nm ePAR Sensor

Make:  Apogee                                         Model:  SQ-610
✅ Total ePAR intensity measurements over plant canopies.
✅ Monitor and adjust grow lights.
✅ Multiple output option.
✅ Cosine-corrected with directional errors. Long-term non-stability.
✅ High quality cable.

Apogee’s newest, cutting-edge ePAR sensor was created in 2021 as an upgrade to our ePFD sensor and designed to measure the newly defined 400-750 nm ePAR radiation range that research has shown to be photosynthetically active, beyond the traditional 400-700 nm range. The SQ-610 ePAR sensor is a self-powered sensor. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor cable includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement from permanent installations for maintenance and calibration. Typical applications of ePAR sensors include measuring total ePAR intensity over plant canopies in all growing environments, monitoring and adjusting grow lights, and researching plant morphogenic activity and photobiology. Many next generation LED fixtures, the sun, and other light sources emit these newly confirmed Far-red photosynthetic wavelengths, but they have not been measurable by traditional 400-700 nm PAR meters until now.

The analog version of this sensor (SQ-610) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the microCache.





General Specification



140 g


30.5 mm diameter, 37 mm height

Measurement Range

0 to 4000 µmol m-2 s-1

Operating Temperature

-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m

Temperature Response

-0.11 ± 0.04 % per C

Cable Length

5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel
(316), M8 connector located 25 cm from sensor head

Field Of View


Protection Level



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