The article is dedicated to the organization and performance of bilateral interlaboratory comparisons calibration results for electrical capacity measures inductivity at frequency 1 kHz. Interlaboratory measuring instruments electric quantities are presented. Evaluation laboratory bias provided by means functioning statistics En number. Analysis conclusions concerning competence obtained.

Three years after the first interlaboratory comparison programme (ILC) for extremely low frequency electromagnetic fields (ELF EMF), twelve participating laboratories measured the values of electric and magnetic fields including frequency in three stages at specified positions and distances from the field sources. This paper presents the measurements procedure, the results and their evaluation ...

Dissolved oxygen concentration is a key parameter for characterizing natural and wastewaters and for assessing the global state of the environment in general. The decrease of dissolved oxygen levels in the world’s oceans, which is becoming increasingly obvious, is expected to have an impact on the whole ecosystem of the Earth, including the carbon cycle, the climate, etc. Dissolved oxygen measu...