The custom designed 12.5 kHz T-shape QTF is the most performant solution for spectroscopic applications based on Quartz-Enhanced PhotoAcoustic Spectroscopy (QEPAS).

The custom designed 9.8 kHz T-shape QTF with carved grooves on prongs surface is the optimal solution for spectroscopic applications based on Light-Induced Thermo-Elastic Spectroscopy (LITES).

The custom designed 15 kHz I-shape QTF is the optimal solution to couple quartz-enhanced photoacoustic spectroscopy (QEPAS) with light source characterized by large beam diameter due to its enlarged prong spacing.

The custom designed 2.8 kHz I-shape QTF is the optimal solution for dual gas detection employing quartz-enhanced photoacoustic spectroscopy (QEPAS).