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News from Symmetry


Laboratory probe holder 

This is universal laboratory probe holder. It has outstanding chemical inertness, made exclusively from SAE 300 series stainless steels. The holder provides repeatable positioning of probes. 

Ebook "Metrology Companion  the new SI ebook on concepts and computations in measurements" 

This ebook is published in PDF version. It consists of about minimal and sufficient set of concepts and methods required to compute a measurement result and its standard measurement uncertainty. The book includes novelties after the fundamental revision of the International System of Units (SI). 

Document “New SI base units” 

The current International System of Units (SI) has emerged as perhaps the most significant revision of the SI. Now, the seven SI base units are defined using only seven “defining constants” whose values are taken as exact. 


