Accurate groundwater surveys with sTEM

The sTEM geoscanner

Unlock hidden Groundwater Resources with Ease

The sTEM geoscanner is a unique invention for precise and efficient groundwater surveys. The sTEM conducts single-site measurements, capturing data that reaches depths beyond 300 m (980ft). With its affordability and robustness, the sTEM geoscanner is operated via Android or iOS app and offers valuable insights into groundwater resources. The sTEM geoscanner ensures efficient surveys with reliable performance. Its transmitter capacity enables robust measurements, covering a substantial area per station.

Designed for convenience, the lightweight and portable sTEM geoscanner, with transmitter wire and receiver cable, weighs approximately a total of only 30 kg. It can be easily transported in a solid shipping box as check-in luggage on airplanes. With Wi-Fi and internet connectivity, enjoy seamless data upload and remote support.


The sTEM system comes with

  • 40 x 40 m (131 x 131 feet)
  • 20 x 20 m options (65 x 65 feet)

Difference between sTEM and sTEM+

sTEM outputs a maximum of 5 Amp on the high transmitter moment. This cost-effective and user-friendly instrument allows for measuring of more than 15 stations per day. With the sTEM geoscanner, you can explore the depths of the subsurface and gain valuable insights into the groundwater resources. Although the resolution of the measurements may be lower compared to the tTEM geoscanner, the sTEM system offers an effective and cost-efficient solution for conducting surveys. Its ease of operation makes it an ideal choice for various applications in groundwater exploration. Moreover, the geoscanner is equipped with Wi-Fi and internet connectivity, enabling remote support and seamless data upload.

Unique features of the sTEM and sTEM+ instruments

  • Dual moment system for shallow and deep information
  • Integrated Tx and Rx hardware in one unit
  • Transmitter loop size: 20 x 20 m or 40 x 40 m options
    (65 x 65 feet, 131 x 131 feet)
  • Active current regulation, 1 A low transmitter moment
    5/10 A high transmitter moment (sTEM/sTEM+)
  • Depth of investigation: Up to 300 m (980 ft)
  • Power supply: Two 14,4 V lithium batteries at 99Wh each. Corresponds to a full day of operation
  • Total weight (including transmitter and receiver coils): around 32 kg (70.5 lbs).
  • Portability: Shipping box for convenient airplane check-in.
  • Connectivity: Wi-Fi and internet for remote support and uploade of data to cloud
  • Operated by Android and iOS App
  • Suppression of external noise by tapered gating
  • Real-time data stacking and calculation of data certainties
  • Automatic sign correction of data
  • Real-time data inversion

“"We've wrapped up the field work here in Kakuma. I got to say, excellent work with the sTEM. You guys have really built an incredible system. The Kenyans, with no geophysics experience, can collect data without support after maybe 2 or 3 sites. They were able to measure at a site, start to finish, in 10 mins 20 seconds. And the app is really easy to use. One of them asked if sTEM stood for simple TEM because it was so easy."”

Denys GrombacherAssistant Professor, Aarhus University
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