Measurement time:

Porometer: 5 to 15 seconds typically, depending on species, leaf or needle surface characteristics, and conditions

Fluorometer: 1 second

Operating conditions:

Temperature: 0 to 50 °C

Pressure: 50 to 110 kPa

Humidity: 0 to 85%; non-condensing

Weight: 0.73 kg

Dimensions: 32.4 cm x 16.9 cm x 6.2 cm (L x W x H)


Dimensions: 6.8 cm diagonally

Resolution: 400 x 200 pixels; sunlight readable monochrome

Keypad: 5-button membrane pad


Built-in Li-ion

Operating hours: 8 hours typically

Capacity: 5200 mAh

Recharging time: 3.5 hours typically; 2 hours with Qualcomm® Quick Charge™ 2.0 or 3.0

Data storage: 128 MB

USB specifications:

Communication/charging interface: Micro-B

Qualcomm® Quick Charge™ 2.0 or 3.0 for rapid charging

Universal charging adapter:

Input: 90 to 264 VAC; 50 to 60 Hz

Output: 5 VDC; 1 Amp

Configuration Software: Windows® and macOS® applications

Data Output: Plain text files (comma or tab delimited), and Excel files with embedded equations.

Barcode scanner: 1-D and 2-D, including Code 39, Code 128, PDF417, 100% UPC, Data Matrix, QR Code

Photosynthetically Actively Radiation (PAR) measurement:

Units: Photosynthetic Photon Flux Density (PPFD); μmol m-2 s-1

Calibration accuracy: ±10% of reading; traceable to NIST

Cosine correction: Cosine corrected up to 60° angle of incidence


Leaf and needle sizes:

1–3.5 mm width

14.2 mm minimum length

2.8 mm maximum thickness

Flow rates:

Low: 75 µmol s-1

Medium: 115 µmol s-1

High: 150 µmol s-1

RH sensor accuracy: ±2% RH

Reference temperature: ±0.2 °C

Leaf temperature sensor accuracy: ±0.5 °C

Inlet flow measurement: ±1% of reading from 75 µmol s-1 to 150 µmol s-1

Exhaust flow measurement: ±5% of full scale up to 150 µmol s-1


gsw mol m-2 s-1; gbw mol m-2 s-1; gtw mol m-2 s-1; E mmol m-2 s-1

VPcham kPa; VPref kPa; VPleaf kPa; VPDleaf kPa

H2Oref mmol mol-1; H2Osamp mmol mol-1; H2Oleaf mmol mol-1


Flash types: User configurable Rectangular and Multiphase Flash™ (MPF)

Measuring light peak wavelength: 625 nm

Measuring light peak intensity:

0 to 10,000 µmol m-2 s-1

Flash intensity: 0 to 7500 µmol m-2 s-1

LED Risk Group: Exempt group in acc. with IEC 62471:2006. The LED does not pose any photobiological hazard.


Fo; Fm; Fv; Fv/Fm; Fs; Fm’; ΦPSII; ETR

GPS Receiver

GPS: Accuracy 2.5 m CEP (circular error probable)