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

PAR-FluorPen FP 110-LM

PAR-FluorPen FP 110-LM/S and PAR-FluorPen FP 110-LM/D include all features of the FluorPen FP 100-MAX, i.e., they measure chlorophyll fluorescence parameters Ft, QY, NPQ, OJIP, and Light Curve (QY). They feature an integrated GPS Module.

Besides that, the PAR-FluorPen incorporates an integrated Light Meter for direct digital readouts of Photosynthetically Active Radiation (PAR) in the range from 400 to 700 nm, the span in which plants use energy during photosynthesis. PAR is measured as Photosynthetic Photon Flux Density (PPFD), which is indicated by units of quanta (photons) per unit time per unit surface area. The sensor has a uniform response to photons within the 400-700 nm waveband. Instant readouts are provided as average values of 20 measurements.

PAR-FluorPen FP 110-LM/S
Handheld fluorometer with integrated Light Meter, GPS module, USB/Bluetooth communication and dedicated software.. Measured parameters: PAR, Ft, QY, OJIP, NPQ, LC. The “S“ version uses firmly attached leaf-clip.

PAR-FluorPen FP 110-LM/D
Handheld fluorometer with integrated Light Meter, GPS module, USB/Bluetooth communication and dedicated software.. Measured parameters: PAR, Ft, QY, OJIP, NPQ, LC. The “D“ version is intended for use with detachable leaf-clips (clips are sold separately).

PAR-FluorPen FP 110-LM/X
Handheld fluorometer with integrated Light Meter, GPS module, USB/Bluetooth communication and dedicated software. Measured parameters: PAR, Ft, QY, OJIP, NPQ, LC. The “X“ version is mounted with custom-made leaf-clip.

Measured Parameters:

  • PAR
    Photosynthetically Active Radiation measured as Photosynthetic Photon Flux Density (PPFD).
  • FT
    Continuous fluorescence yield in non-actinic light. FTis equivalent to F0 if the leaf sample is dark-adapted.
  • QY
    Photosystem II Quantum Yield. QY is equivalent to FV/FM in the dark-adapted samples and to FV ‘ /FM ‘ in the light-adapted samples.
  • OJIP Analysis
    Application of chlorophyll fluorescence fast-transient analysis (OJIP) is a simple and non-invasive tool to monitor chloroplast function. Provided OJIP analysis is used as sensitive and reliable fast test for the functionality and vitality of photosynthetic system.
  • NPQ – Non-Photochemical Quenching
    Provided are two predefined NPQ protocols differing in the duration of light exposure and dark recovery phase as well as in the number of intervals between the pulses. It is typically used for quantification of photochemical and non-photochemical quenching in dark-adapted samples.
  • Light Curve
    There are three predefined Light Curve protocols based on pulse modulated fluorometry differing in number and duration of single light phases and light intensities. Light Curve protocols provide successive measurements of the sample photosynthesis under various light intensities of continuous illumination relating the rate of photosynthesis to photon flux density.

Several types of leaf-clip are available:

Standard leaf-clip: suitable for experiments where short term dark adaptation is needed.


Open leaf-clip: suitable for measurements in ambient light (experiments where no dark adaptation is required).


Customised sample holders: for instance, for mosses, lichens and other experimental material.


Detachable leaf-clips: suitable for experiments where long term dark adaptation is needed. They also allow simultaneous dark-adaptation of several leaves using several clips in situ under light, and then doing the readings one after another by attaching the device unit to each clip.


Other Optional Features and Accessories:

Recalibration of the PAR Sensor
Recalibration of the PAR sensor in the PAR-FluorPen device – recommended after 2 years of use.

Replacement USB Communication Cable
Replacement USB cable allowing connection between the “pen” devices and a PC (the device is delivered with one USB cable, which is included in the device price).

Battery Charger
Includes battery charger and 4 AAA alkaline rechargeable batteries. EU norm only.Detachable Leaf-Clips
Supplementary detachable leaf-clips for use with the PAR-FluorPen FP 110-LM/D. 10-piece set.
Measured/Calculated Parameters: PAR (measured as PPFD); F0 ; FT ; FM ; FM ‘ ; QY; OJIP; NPQ 1,2; Light Curve 1,2,3
Cosine Correction: Cosine corrected up to 80° angle of incidence
PAR Sensor Linearity: Maximum deviation 1% – up to 3,000 µmol s-1 m-2
Saturating Light: Adjustable from 0 to 100% (up to 3,000 µmol (photon) m-2 s-1)
Actinic Light: Adjustable from 0 to 100% (up to 1,000 µmol (photon) m-2 s-1)
Measuring Light: Adjustable from 0 to 100% (up to 0.09 µmol (photon) m-2 per pulse)
Emitter: Blue 470 nm LED – optically filtered and precisely focused
Optical Aperture Diameter: 5 mm (standard and open leaf-clip); 6.5 mm (detachable leaf-clip)
Detector Wavelength Range: PIN photodiode with 667 to 750 nm bandpass filters
FluorPen Software Requirements: Windows 2000, XP, or higher*
Memory Capacity (16 Mb): Ft: up to 149,000 measurements
QY: up to 95,000 measurements
LC1: up to 3,000 measurements
LC2: up to 3,500 measurements
LC3: up to 2,600 measurements
NPQ1: up to 800 measurements
NPQ2: up to 500 measurements
OJIP: up to 1,100 measurements
Display: 2 x 8 characters LCD
Keypad: Sealed, 2-key tactile response
Keypad Escape Time: Turns off after 5 minutes of no use
Power Supply: 4 AAA alkaline or rechargeable batteries
Battery Life: 48 hours typical with full operation
Low Battery Detection: Low battery indication displayed
Size: 120 mm x 57 mm x 30 mm (4.7″ x 2.2″ x 1.2″)
Weight: 180 g, 6.5 oz
Sample Holder: Mechanical leaf clip
Operating Conditions: 0 to 55°C; 32 to 130°F. RH: 0 to 95% (non-condensing)
Storage Conditions: -10 to +60°C; 14 to +140°F. RH: 0 to 95% (non-condensing)
Warranty: 1 year parts and labour