Industrial IoT solutions for grid monitoring and industry 4.0. Crest Sensors is a company specialized in IoT solutions for grid monitoring and industry 4.0. With our own development department and years of experience in measuring low voltage & medium voltage grids, gas networks, water networks and industry, we have developed a range of measurement solutions to support the digitization in the energy market. According to Crest, measurement is the key to making the energy transition possible.