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Item #:
50434730
SQ-520: Full-Spectrum Smart Quantum Sensor (USB) with Apogee Instruments Neoprene Case
Item #:
50434730
COP 2555686
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The MQ-500 is the premium PAR meter of choice of research scientists and serious growers who need absolutely accurate PAR measurements season after season.
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What Stands Out
Full-Spectrum Measurement
Accurately measures quantum photosynthetically active radiation across all light wavelengths, ensuring optimal growth conditions for plants by providing precise data for both indoor light sources and natural sunlight.
User-Friendly Interface
Designed for ease of use, the digital display allows growers to quickly assess light levels, making it accessible for both novice and expert horticulturists seeking effective plant monitoring solutions.
Durable Design
Built with high-quality materials to withstand the rigors of indoor growing environments, ensuring long-lasting performance and reliability for consistent monitoring of plant needs throughout their growth cycle.
Product Details
- DR BRUCE BUGBEE: Apogee PAR sensors have been designed and refined by Dr. Bruce Bugbee, a world-famous crop physiologist.
- PREMIUM QUALITY: The SQ-520 is preferred by scientists and serious growers for accurate PAR measurements. Our sensors stay accurate and reliable while other budget PAR sensors can have readings drift by over 50%.
- FEATURES: USB-compatible smart quantum sensor connects directly to a computer (Windows or macOS X) for spot measurements, real-time PPFD graphing, and datalogging with ApogeeConnect software. It also functions as a stand-alone PAR datalogger by connecting to most standard 5V DC USB power plugs. The sensor head's internal memory stores up to 10,000 user-defined periodic measurements, downloadable as a CSV file for computer analysis.
- HIGHLY ACCURATE & STABLE: This sensor precisely measures photon intensity between 400 and 700 nm, providing a single PAR reading in µmol m-2 s-1 within 5% uncertainty. Its calibration maintains stability with an accuracy drift rate of less than 2% per year, unlike hobby-grade PAR sensors.
| Package Weight | 2.53 Pound |
| Country of Origin | This item will be imported from US |
Product Technical Details
| Package Dimensions | 9.72 x 6.38 x 2.4 inches |
| Item Weight | 12 ounces |
| Manufacturer | Apogee Instruments |
| Batteries | 1 Lithium Metal batteries required. |
What's in the box
Neoprene Carrying Case
Who Should Buy?
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Indoor Gardeners
Ideal for indoor gardeners wanting precise measurements of light intensity for optimal plant growth and health.
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Research Facilities
Great for research institutions conducting experiments on plant growth and light requirements in controlled environments.
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Horticulture Professionals
Beneficial for horticulturists needing reliable data for light management in commercial growing operations.
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Home Gardeners
May not be necessary for casual home gardeners who do not require precise light measurements.
Product Description
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Answer: The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.
Apogee Instruments Light Measurement Editorial Review
The Apogee Instruments SQ-520 is a full-spectrum smart quantum sensor with a USB connection and a neoprene case. While some customers have struggled with the device's usability due to inadequate instructions, others have praised it for its quality and accuracy. One customer reported frustration with a defective battery cover, but it's unclear if the issue was resolved. However, another customer's first impressions were positive, noting that the sensor was built like a tank and provided accurate readings to their spectroradiometer. The reviewer noted that the sensor only measures PAR and not far red, as opposed to the Apogee Instruments ePAR meter, which was able to detect the far red in their Iluminar fixtures.
Customer Reviews & Ratings
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Pros
- Accurate readings
- High-quality build
- Full-spectrum sensor
Cons
- Inadequate instructions
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Last Updated on August 10, 2026
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Features & Benefits
- Ruggedized and precision optics
- Measure PAR not Lux
- Dr. Bruce Bugbee designed
- Measures total photosynthetic photons
- Can log measurements over a 24 hour period
- Authentic Apogee PAR meters are recommended as the standard by most lighting manufacturers
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