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Teledesign TS4000 900MHz UHF/VHF

True cloud-based sensor configuration, logging, reporting and data analysis all-in-one.


Shark (RS232/RS485 Bluetooth Serial Adapter)


A cloud-based interface to configure hardware, visualize data, analyze measurements, manage alarms, calculations, and set up data routing.

MEASUREMENTS TO MIND (M2M) is a growing suite of Stevens products that embraces cloud-computing with an all-inclusive vision of shortening the communication path from the sensors to data on-line. That is, what the sensors MEASURE the MIND sees.

The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.


SOLO (smart SDI-12 power manager)
JL-2 (solar charge controller)
Power Supplies
Solar Panels

Smart SDI-12 power manager that also provides remote power cycling.

The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.

The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.

Van Essen Instruments CTD-Diver

Pressure transducer with integrated logger

Part # 51144

ctd diver

Frequent monitoring of soil and groundwater quality is traditionally a labor-intensive job. This is also the case if saltwater intrusion or contamination at remediation sites needs to be monitored.

The Van Essen CTD-Diver sets the standard for reliability and longevity in groundwater monitoring. The CTD-Diver is a fully stand-alone sensor with built-in data logger and battery. The compact ceramic casing and sensor and unparalleled conductivity measuring range (0-120 mS/cm) make the CTD-Diver suitable for use at every measuring site.

The CTD-Diver is impervious to the most aggressive substances found in water environments. Its ceramic casing resists when even the strongest metals yield.

CTD-Diver is a highly reliable compact probe for the simultaneous measuring of groundwater level, temperature, and conductivity. Measured values are stored in the probe's non-volatile internal memory.

In addition to internal data storage, the CTD-Diver can be connected to an external data logger, such as the Stevens DataLogic 3000, or data telemetry systems with the Diver-SDI SDI-12 output adapter, allowing the Diver to be used for real-time data monitoring applications.

Manual data download in the field from a Diver's internal storage can be done by utilizing the optional USB Interface Cable and connecting the diver directly to a desktop or laptop PC.

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Related products

What's the Easiest and Quickest Way to Start Collecting Data and Access it Anywhere?

The Answer's in the Cloud.

eTracker is a cellular modem and "virtual" cloud-based data logger in one (meaning you don't need to install a separate data logger). Simply connect your sensor and a power source to eTracker and you're done. Configure (or reconfigure) anytime from any Internet-connected device, and use Stevens-Connect to retrieve your data, or forward it to your favorite software system.

Technical Specifications


Internal Battery, 10-year life with "typical" use

  • 5 million measurements
  • 2,000 readout cycles
  • 2,000 programming cycles

Sample interval

1 second to 99 hours

Data output options

  • SDI-12 when connected to Diver-DCX converter box
  • Manual data download using USB interface cable connected to computer
  • Manual data download using "Diver Mate" or "Diver USB Reading Unit" accessories

Conductivity Measurement

Range: 10 µS/cm to 120 mS/cm
Accuracy: ± 1.0% of reading
Resolution: ± 0.1% of reading

Operating temperature, compensated

32 °F to 122 °F (0 °C to 50 °C)

Temperature accuracy

± 0.18 °F

Temperature resolution

0.018 °F

Wetted parts materials

Housing: ceramic (ZrO2)
Conductivity sensor: platinum electrodes on ceramic (AI2 O3) carrier
O-rings: Viton®
Pressure sensor: ceramic (AI2O3)
Cap / nose cone: Nylon PA6 30% glass fiber

Physical size

5.31 in x Ø0.86 in (135 mm x Ø22 mm) including suspension eye


3.5 oz (100 grams)

Depth Range Typical Accuracy Long-Term Stability Resolution
33 ft (10 m) ±0.05% FS ±0.2% FS 0.07 in (0.2 cm)
164 ft (50 m) ±0.05% FS ±0.2% FS 0.39 in (1 cm)
328 ft (100 m) ±0.05% FS ±0.2% FS 0.78 in (2 cm)