Conductivity, Temperature, Depth Sensor

Why spend more for less?

The problem with most water depth, temperature, and electrical conductivity sensors (CTD sensors) is that their cost is prohibitively high. Plus they often require an extra barometric pressure sensor to correct for atmospheric pressure. You need a low-cost water level sensor equipped with everything necessary for things like tracking changes in solute movement, groundwater recharge, and surface water hydrology. You need HYDROS 21.


No need for costly extra sensors

A compact 3.4 cm diameter water level sensor that fits into tight spaces, the HYDROS 21 CTD sensor is a low-cost, durable, and easy-to-use tool for monitoring EC, temperature, and depth in both groundwater and surface water. More importantly, it’s an all-in-one instrument. When used with the ZL6 data logger or any other logging system, you won’t require an additional sensor for measuring—and referencing—barometric pressure. With a range of 0 to 120 dS/m and a measuring depth of 10 m, the sensor makes accurate depth and EC measurements for a broad range of applications.

3.4 cm
diameter sensor

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Water level sensor with easy, research-grade data in real time

One of the qualities that makes the HYDROS 21 water level sensor so easy to use is its fast plug-and-play compatibility with the ZL6 data logger (also compatible with Campbell Scientific data loggers). Plus, with the ZL6, you can monitor and remotely access cloud data wirelessly from any internet-connected computer or device in near-real time.

A photo of a HYDROS 21 conductivity, temperature, and depth sensor

METER is trusted by

Stroud Water Research Center
Temple University
Colorado School of Mines

A photo of a HYDROS 21 conductivity, temperature, and depth sensor

Affordable, accurate, and reliable

While engineering the HYDROS 21 water level sensor, we wanted to design a water level sensor that was not only highly accurate but also provided a high degree of value. Because of its low-complexity, low-maintenance, and low-cost design, you can be assured you’re getting an instrument that will save you time, hassle, and money.

A photo of a HYDROS 21 conductivity, temperature, and depth sensor next to a ZL6 Basic data logger

Best price-to-performance ratio on the market

Trying to measure water level, temperature, and EC typically requires an expensive CTD sensor with integrated telemetry. Unlike competitor sensors, all of the HYDROS 21’s data management happens in an external data logger, so the cost of each individual sensor is lower. Now, instead of having to rely on a single point measurement, you can take readings in several different locations without exceeding your budget.

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Feature summary

  • CTD sensor continuously monitors groundwater and surface water level changes
  • Vented sensor means no need for an additional sensor to measure and reference barometric pressure
  • Integrated electrical conductivity and temperature measurement
  • 3.4 cm diameter sensor that fits into tight spaces
  • Low cost
  • Durable
  • Easy to use

A photo of a HYDROS 21 conductivity, temperature, and depth sensor

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