Can this pro be totally submerged underwater? What is the recommended depth of placement?

Yes it can be submerged. There is no recommended depth beyond simply ensuring the sensor on the tip is exposed to the test sample. The cable is 3 feet long.

Can this probe be left in contact with pool water indefinitely?

No, the chlorine is corrosive and will ruin the sensor.

will this work with chemtrol and do you offer an ORP probes

If by chemtrol you mean monitoring wall-mounted meters, then we would recommend the 201DJ-C instead. It features more durable and enduring design for long-term water testing and less likelihood of losing calibration to turbulent water as quickly as the 201-C. Yes, there is an ORP probe, the Apera 301PT-C.

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⚡ Measure Smarter, Not Harder — Stay Ahead with Precision pH Tech!

BUILT TO LAST - Durable polycarbonate body paired with a protective sensor shield guards against accidental damage.
WIDE MEASUREMENT RANGE - Accurately measures pH from 0 to 14 and temperatures up to 80°C (176°F) for versatile lab and field use.
PLUG PLAY COMPATIBILITY - Standard BNC connector ensures effortless integration with most pH meters on the market.
RAPID RELIABLE READINGS - Special lithium glass membrane delivers quick, stable pH measurements every time.
CERTIFIED QUALITY ASSURANCE - CE, RoHS certified and ISO 9001:2015 manufactured for trusted, professional-grade performance.

The Apera Instruments 201-C Combination pH Electrode features a low-impedance lithium glass membrane for fast, stable pH readings across a full 0–14 pH range. Its durable polycarbonate body and detachable sensor shield protect the sensitive glass membrane, while the standard BNC connector ensures broad compatibility. Ideal for scientific research, environmental monitoring, and quality control, it operates reliably up to 80°C and is certified CE, RoHS, and ISO 9001:2015 for professional-grade accuracy and durability.