Van Essen Instruments was founded in 1938 and is located in Delft, The Netherlands. Since 1995, Van Essen Instruments has focused their efforts on their strong development department. The company has gained an excellent reputation, both nationally and internationally, by targeting specific and promising market segments. This focus has enabled Van Essen Instruments to distinguish itself from its competitors in the quality and practicality of its instruments, such as the DIVER groundwater datalogger.
In 2001 Schlumberger has acquired Van Essen Instruments (VEI) and VEI is now part of Schlumberger Water Services (SWS).