How to treat correct
We strongly recommend that any threaded PG 13.5 sensor is tighten with max 1 Nm into any SUB or SUF head plate. Same rules for CerCell products as well as for other brands.
Use your fingers if you are a man and the little CerCell spanner tool if you are a woman! We are dealing with plastics and not stainless steel! It's only an O-ring that needs to be compressed slightly. Its not the wheel on a vehicle you need to fasten!
If your preferred DO sensor is like the shown MT Polarographic then the tool can be of help.
Well, we have seen several really bad uses of hand tools. Not correctly chosen tools will for sure both over-tighten and destroy the sensor as well as the bioreactor … so take your time! Never use the tools seen above!