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Enabling better global research outcomes in soil, plant & environmental monitoring.

PQ-100 Package: microCache and PAR-FAR Sensor

This promotional package includes both an Apogee SQ-110 Original Quantum PAR Sensor with a 30 cm cable and microCache Bluetooth micro-logger. When paired, these two devices are a powerful tool for monitoring photosynthetically active radiation with research-grade accuracy for optimal plant growth.

The SQ-110 sensor is a trusted industry standard for making accurate PPFD measurements.

The new AT-100 microCache (µCache) micro-logger is a rugged, standalone, battery-powered device that can collect over 400,000 data points and connects your sensor to your iOS or Android device via Bluetooth using our ApogeeConnect app. The app allows you to make real-time measurements, set custom datalogging intervals, monitor and graph daily lights integrals, measure photoperiods, download datasets, and more.


Alternatively, the PQ110 Package comes with a 2M length cable.

µCache (AT-100)
Communication Protocol Bluetooth® Low Energy (Bluetooth 4.0+)
Bluetooth Range approx. 45 m (line-of-sight)
Data Logging Capability Averaging Interval: 1-60 minutes
Sampling Interval: ≥ 1 second
Data Log Capacity Over 400,000 Entries (approx. 9 months at a 1-minute logging interval)
Time Accuracy ± 30 seconds per month at 0° C – 70° C
Battery Type 2/3 AA 3.6 Volt Lithium Battery
Battery Life
(impacted by sampling interval
and amount of time connected to a mobile app)
approx. 1 year w/ 10-second sampling interval and an average of 5 minutes daily connected time
approx. 2 years w/ 60-second sampling interval and an average of 5 minutes daily connected time
Operating Environment -40 to 85 C
Dimensions 66 mm length, 55 mm width, 18 mm height
Weight 52 g
IP Rating IP67
Connector Type M8
ADC Resolution 24 bits


Power Supply Self-powered
Output (Sensitivity) 0.2 mV per µmol m-2 s-1
Output Type 0 to 800 mV
Calibration Factor (reciprocal of sensitivity) 5 µmol m-2 s-1 per mV
Calibration Uncertainty ± 5 %
Measurement Repeatability Less than 0.5 %
Long-term Drift Less than 2 % per year
Non-linearity Less than 1 % (up to 4000 µmol m-2 s-1)
Response Time Less than 1 ms
Field of View 180°
Spectral Range 410 to 655 nm (wavelengths where response is greater than 50 % of maximum)
Spectral Selectivity Less than 10 % from 469 to 655 nm
Directional (Cosine) Response ± 5 % at 75° zenith angle
Temperature Response 0.06 ± 0.06 % per C
Operating Environment -40 to 70 C; 0 to 100 % relative humidity;
can be submerged in water up to depths of 30 m
Dimensions 24 mm diameter, 33 mm height
Mass (with 5 m of cable) 90 g


Package Cable Length
PQ-100 30 cm
PQ-110 2 metres