Is the probe submersible? I want to measure DO in the lower portions on a pond without having to try to capture samples.

The probe is submersible but not the top controller part. I spliced in a piece of 4 conductor cable to get it deeper.

how long is the probe ?

The probe is five inches in length.

Does this work in the mountains at 5,000 feet elevation?

The manual says it does not compensate for altitude/pressure. Only temperature. Its unclear if it would work properly at 5,000 feet.

Does it come with a calibration solution or, how do you make anaerobic water?

I bought this thing recently for transporting fish/trout. Couple things to note I have found. No Calibration solution. I find it odd that the way you calibrate is against outside air. You calibrate it in air or zero it out against air. Then use it. I also found that it needs to be calibrated every use. I may try calibrating in a solution of saturated C02 ( in other words take all the oxygen out ) but I have no way of knowing just exactly when that may be. The temperature ( and if indeed the DO is accurate ) takes over a minute to be the same accuracy as analog pool thermometer. IDK if I ultimately trust this thing based on some things here. Does not make sense readings of 3mg/L in water supporting trout, when they need 6+ or they'd be jumping out of water and dying. So, not convinced the thing can be calibrated correctly in order to read correctly. Hope this answers any questions.

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💧 Dive into precision with every measurement!

SMART ENERGY SAVING - Auto power-off after 8 minutes of inactivity to extend battery life.
USER FRIENDLY DESIGN - Digital display with backlight ensures easy data reading, even in low light.
PRECISION MEASUREMENT - Accurate dissolved oxygen and temperature readings for optimal aquatic health.
VERSATILE APPLICATIONS - Perfect for aquariums, pools, and scientific research—wherever water quality matters.
HASSLE FREE CALIBRATION - No need to open the electrode cover for calibration—just dip and measure!

The Dissolved Oxygen Meter is a cutting-edge instrument designed for accurate measurement of dissolved oxygen levels and temperature in various aquatic environments. With a measurement range of 0.0-40.0 mg/L, it features a polarographic sensor and a user-friendly digital display. Ideal for aquariums, pools, and scientific research, this meter ensures reliable readings with easy calibration and energy-saving features.

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DO9100

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