Water Quality Learning Center

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Start here / fundamentals

EC vs TDS vs Salinity

Related readings are not interchangeable. Understand conductivity, device-specific TDS estimates, salinity and specific gravity before comparing numbers.

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Unit relationship / not a live reading

1 mS/cm
= 1,000 µS/cm

EC uses conductivity units. A TDS estimate also needs a device-specific conversion factor.

Monitoring fundamentals

Build a sound foundation.

Rovynel Learning Center

Where to Place a Temperature and Humidity Sensor

Use representative placement, avoid local heat and moisture sources, and deploy multiple sensors when one point cannot describe the whole space.

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Rovynel Learning Center

Relative Humidity, Dew Point, and VPD Explained

Understand the difference between relative humidity, dew point, and vapor pressure deficit, and why temperature and leaf conditions matter.

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Rovynel Learning Center

What Is Dissolved Oxygen? A Water Monitoring Guide

Learn what dissolved oxygen means, how temperature and biological activity affect it, and why application-specific action levels are essential.

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Rovynel Learning Center

What Is ORP? Oxidation-Reduction Potential Explained

Understand what ORP measures, why it is reported in millivolts, and why ORP should be interpreted with pH, chemistry, and measurement conditions.

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Rovynel Learning Center

Water Temperature: Why It Changes Water Quality Readings

Learn why water temperature affects biology, reaction rates, dissolved oxygen, conductivity, and the interpretation of water-monitoring trends.

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Rovynel Learning Center

EC vs. TDS vs. Salinity: What Is the Difference?

Compare EC, estimated TDS, and salinity so you can choose the right primary reading and avoid confusing conversion-based values.

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Rovynel Learning Center

What Is TDS? Total Dissolved Solids and Meter Readings

Understand total dissolved solids, why handheld meters often estimate TDS from conductivity, and why the conversion factor must be stated.

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Rovynel Learning Center

What Is EC? Electrical Conductivity in Water Explained

Learn what electrical conductivity measures, why temperature and dissolved ions matter, and how EC differs from a direct chemical analysis.

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Rovynel Learning Center

What Is pH? A Practical Water Monitoring Guide

Understand what pH measures, why it matters, how to measure it, and why application-specific targets are more useful than one universal number.

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Practical water guides

Understand your water-care routine.

Water Quality Guides

HY485 Hydroponic pH Calibration Guide

A two-video guide for preparing pH 4.01, 6.86 and 9.18 buffers and completing three-point pH calibration on the Rovynel HY485 hydroponic monitor.

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Water Quality Guides

10.0 Series pH, Salinity and Specific Gravity Calibration Guide

A three-video guide for the Rovynel 10.0 Series covering pH buffer preparation, pH calibration, and salinity and specific gravity adjustment.

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Water Quality Guides

M485 pH and Salinity Calibration Guide

A three-step Rovynel M485 video guide covering pH buffer preparation, three-point pH calibration, and salinity and specific gravity adjustment.

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Water Quality Guides

App Alert & Calibration Support for Your Rovynel Pool Monitor

Set Tuya Smart or Smart Life app alerts for your Rovynel pool monitor and learn how to contact Rovynel support for reading calibration help.

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Water Quality Guides

Pool Monitor Setup Video

A smoother step-by-step Rovynel pool monitor setup guide with three short videos, viewing notes, and a final setup checklist.

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Water Quality Guides

WiFi vs LoRa Water Quality Monitor: Which One to Choose?

Compare the separate sensor and app connections in Rovynel Pool LoRa, M485, 10.0 Series and HY485 monitors, including the WiFi requirements.

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Water Quality Guides

How Often Should You Calibrate a Water Quality Sensor?

A practical calibration schedule guide for pH, EC, TDS, salinity and ORP water monitoring sensors.

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Water Quality Guides

How to Monitor pH, Salinity and ORP in Aquariums

A practical guide to monitoring pH, salinity and ORP in freshwater, saltwater and reef aquariums.

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Water Quality Guides

Best Aquarium Water Quality Monitor for Reef Tanks

How reef tank owners can choose a smart water quality monitor for pH, salinity, ORP and temperature trend awareness.

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Water Quality Guides

How to Monitor Pool pH and ORP Automatically

Learn how automatic pH and ORP monitoring helps pool owners understand water trends between manual tests.

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Water Quality Guides

Best Pool Water Quality Monitor for Home Pools

A practical guide to choosing a smart pool water quality monitor for home pools, spas and hot tubs.

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Water Quality Guides

Hydroponics EC and pH Monitoring Basics for Beginners

Learn how pH, EC, TDS and temperature help hydroponic monitoring, then compare HY485 air-and-water sensing with water-only systems.

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Water Quality Guides

Pool Chlorine vs ORP: What Should You Track?

A simple explanation of chlorine and ORP for pool owners choosing a smart water monitor.

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Water Quality Guides

Aquarium Water Parameters Guide for Beginners

A beginner-friendly guide to pH, temperature, salinity, TDS, EC and ORP in aquarium water monitoring.

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Plant and aquatic libraries

The context around your readings.

Crop profile library

Starting points for pH and EC, with care notes and reference sources.

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Aquatic profile library

Species-specific water-care context. Use independent tests for unmeasured parameters.

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Online manuals & calibration guides