Why a firm is open sourcing their testing equipment

https://opensource.com/article/17/4/open-hardware-nitrate-testing-photometer?sc_cid=7016000000127ECAAY

One way a company can start the transition to the open source way is to open source a single product to drive sales of its other products.

A firm can open source the hardware they sell in order to expand the market of other parts of their product line. This is referred to as a secondary supplier model.