The counter probes 70 091 and 70 045 were developed to be able to provide efficient solutions to a great variety of measuring problems. Its field of application ranges from environmental monitoring to measuring functions in nuclear power stations. The tubes are fully enclosed in a robust and waterproof aluminium housing. Counter tube combinations can be selected for optimum adjustment to the measuring problem to be solved. The digital interface RS 485 or USB (alternatively) makes it possible to communicate directly with a PC or build up networks with addressable single probes.