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

P2-141 Package: microCache and PAR-FAR Sensor

This promotional package includes both an S2-141 PAR-FAR sensor with a 30 cm cable and microCache Bluetooth micro-logger at a special introductory price. When paired, these two devices are a powerful tool for monitoring photosynthetically active radiation with research-grade accuracy for optimal plant growth.

The S2-141 PAR-FAR sensor is a unique two-channel sensor for measuring both the PAR (PPFD) and Far-red outputs of electric grow lights.

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 P2-142 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


S2-141 Par Far Red Sensor
Power Supply: Self-Powered
Output (sensitivity): 0.01 mV per μmol m⁻² s⁻¹ (PAR)
0.02 mV per μmol m⁻² s⁻¹ (Far Red)
Calibration Factor (reciprocal of sensitivity): 100 μmol m⁻² s⁻¹ per mV (PAR)
50 μmol m⁻² s⁻¹ per mV (Far Red)
Calibration Uncertainty: ± 5%
Output Range: 0 to 40 mV (PAR)
0 to 20 mV (Far Red)
Measurement Repeatability: Less than 1%
Long-term Drift: Less than 2% per year
Non-Linearity: Less than 1% (up to 4000 μmol m⁻² s⁻¹) (PAR)
Less than 1% (up to 1000 μmol m⁻² s⁻¹) (Far Red)
Response Time: Less than 1 ms
Field of View: 180°
Spectral Ranges: 389 to 692 nm ± 5 nm (PAR)
700 to 760 nm ± 5 nm (Far Red)
Directional (Cosine) Response: ± 2% at 45°; ± 5% at 75° zenith angle
Temperature Response: Less than 0.1% per °C
Housing: Anodised aluminium body with acrylic diffuser
IP Rating: IP68
Operating Environment: -40°C to 70°C; 0 to 100% relative humidity
Dimensions: 30.5mm diameter, 36.6mm height
Mass: 51g


Package Cable Length
P2-141 30 cm
P2-142 2 metres