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

AquaPen AP 110/P

Handheld fluorometer for measuring in suspensions with integrated GPS module, USB/Bluetooth communication and dedicated software. Measured parameters: Ft, QY, OJIP, NPQ, LC. The “P“ version uses a submersible measuring probe.

It is equipped with a single blue LED emitter (optionally red or white), optically filtered and precisely focused to deliver light intensities of up to 3000 µmol(photon) m-2 s-1 to measured algal cultures.

The measurements are carried out by a submersible optical probe. The AquaPen-P excels in a high sensitivity – up to 0.5 µg Chl/l. Thus, it can measure even natural water samples containing low concentrations of phytoplankton. It can be used for both lab and field applications.

Data transfer is via USB or Bluetooth communication. Comprehensive FluorPen 1.0 software provides data transfer routines and many additional features for data presentation in tables and graphs. Parameters recorded by the AquaPen-P include FT, QY, NPQ, OJIP Analysis, and Light Curve.

AquaPen-P Measures:

  • 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.


Measured/Calculated Parameters: F0; FT; FM; FM’; QY; OJIP; NPQ 1,2; LC 1,2,3
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: Blue light; 0 to 0.03 µmol (photon) m-2 s-1; adjustable from 0 to 100% (up to 0.09 µmol (photon) m-2 per pulse)
Emitter: Blue 470 nm LED (optionally red or white) – optically filtered and precisely focused
Optical Aperture Diameter: 8 mm
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 3 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: 140 x 55 x 50 mm; (5.5″ x 2.2″ x 2.0″)
Weight: 300 g, 10.6 oz
Sample Holder: Submersible optical probe – 80 mm long; lightguide diameter 8 mm; lightguide end 15 mm in diameter
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