QTest Photometer – Measuring your QTest result is now even easier and more precise
The QTest Photometer is a portable and standalone device for the evaluation of our quantitative tests.
All pure substances have already been measured at the university, and all corresponding data and calibration lines are publicly available.
Beyond that, the QTest Photometer is a true open-source instrument capable of measuring different wavelengths, making it useful for many other laboratory or educational experiments besides QTests.
It measures the color intensity and outputs direct values for the analyzed alkaloids — showing exactly how many milligrams of psilocybin are in your mushroom sample, or how many micrograms of LSD are on your blotter.
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Key Features of the Photometer:
- Precise evaluation of our quantitative QTest color reactions
- Already calibrated for psilocybin/psilocin, MDMA, or LSD
- Open Source and easy to use
- Developed and handbuild in the US by IO Rodeo
The evaluation is therefore much more accurate because individual assessments, interfering variables such as ambient light or similar are no longer necessary. And the best thing is, they come to you already calibrated! All you have to do is pipette/pipet your sample into the cuvette and the result of your QTest is shown directly on the display, no additional computer is required. The accuracy of the concentration analysis increases significantly compared to the evaluation by eye and is now less than 5% deviation from an HPLC analysis and in the range in which HPLC analyses also fluctuate.
The cuvette holder and enclosure are made from 3D-printed black nylon material and the electronics are programmed with open-source firmware written in CircuitPython. The Open Colorimeter ships pre-programmed & ready-to-use so no assembly, soldering or programming is needed.
Each Open Colorimeter includes the following:
- 595nm LED board
- USB cable for battery-charging or power
- Pack of 6 cuvettes: 3 macro (2.5-4.5 mL) and 3 semi-macro (1.5-3.0 mL)
- Light-blocking cap to place over the cuvette during measurements
Additional LED board options
The Open Colorimeter comes with a 595nm LED Board but additional single-wavelength LED boards are available so users can fully customize their instrument. The Colorimeter is Open Hardware certified.






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