How do I put probe into Ca reactor?

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Do you really need to put the probe in the reactor?

Have the effluent of mine going into a small container (pill type container that Crazy-glue came in) sitting over sump. Probe sits in that. If want to measure pH of system, just lift the probe out and drop into tank.

I did have some plastic strain relief connectors used to waterproof cabling into enclosures that I was going to use but thought why.