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

AquaPen AP 110/C

Handheld fluorometer for measuring in suspensions with integrated GPS module, USB/Bluetooth communication and dedicated software. Measured parameters: Ft, QY, OJIP, NPQ, LC, OD 680, and OD 720. The “C“ version performs measuring in a cuvette.

The AquaPen-C is equipped with a blue and red LED emitter, optically filtered and precisely focused to deliver light intensities of up to 3,000 µmol (photon) m-2 s-1 to measured suspensions. Blue excitation light (455 nm) is intended for chlorophyll excitation, i.e., for measuring chlorophyll fluorescence in algal cultures. Red-orange excitation light (620 nm) is intended for excitation through phycobilins and is suitable for measuring in cyanobacteria. Due to high sensitivity – 0.5 µg Chl/l – the AquaPen-C can measure natural water samples containing low concentrations of phytoplankton.

Data transfer is via USB or Bluetooth communication. Comprehensive FluorPen software provides data transfer routines and many additional features for data presentation in tables and graphs. Parameters recorded by the AquaPen-C include FT, QY, NPQ, OJIP Analysis, Light Curve, and also optical density at 680 and 720 nm.

AquaPen-C Measures:

  • FT – Instantaneous Chlorophyll Fluorescence. FT is equivalent to F0 if the sample is dark-adapted.
  • QY – Quantum Yield. QY is a measure of the Photosystem II efficiency. QY is equivalent to FV/FM in dark-adapted samples and to FV ‘ /FM ‘ in light-adapted samples.
  • OJIP – Chlorophyll Fluorescence Transient. OJIP measurement is used as an important biophysical signal that reflects the time course of photosynthesis.
  • NPQ – Non-Photochemical Quenching. NPQ indicates thermal dissipation of absorbed light energy during photosynthesis.
  • LC – Light Curve. Photosystem II Quantum Yield estimated from fluorescence that is measured sequentially in several different light levels.
  • OD – Optical Density at 680 nm and 720 nm.


Measured/Calculated Parameters: F0; FT; FM; FM’; QY; OJIP; NPQ 1,2; LC 1,2,3; OD680, OD720
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: Red and blue light; adjustable from 0 to 100% (up to 0.09 µmol (photon) m-2 per pulse)
Emitter: Blue (455 nm) and red-orange (620 nm) LED – optically filtered and precisely focused
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: 300g, 10.6 oz
Sample Holder: 4 ml cuvette
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