I was wondering what the code is for laboratory equipment (infared gas analyser for photosynthesis measurements). It doesn’t really fall to any of the categories I have found on the trade tariff website. The machine only measures photosynthetic carbon assimilation and when shipped does not include any gas cylinders or any other harmful material.
Such apparatus should be found in Chapter 90, most likely HS code 9027.10xx, 9027.3000 or 9027.5000. You should thus check the explanatory notes for HS position 9027, which matches your item.