In 2016, the Central Office of Measures issued an Expertise Certificate for the mobile piston form that confirms the following:
- the mobile piston form meets the conditions set out in paragraph 23 of “The scope of technical equipment of the verification point depending on the type of verified measuring instrument”, annexed to Regulation of the Minister of Economy and Labour of 12 January, 2005 on the creation of legalization points (the Journal of Laws, no. 15, item 126).
- the indication of measuring instruments included in this position has been referred to the national standards of measurement units,
- the mobile piston form can be used during the verification of the above measuring systems with a volume stream not more than 6 000 dm3/min.