Jan 13 (Reuters) - NI Corp (NATI.O), a provider of testing and measuring equipment, said on Friday it was exploring strategic options after acquisition interest from companies that people familiar with the matter said include Emerson Electric Co (EMR.N). The acquisition interest from potential suitors, according to the sources, forced NI to adopt a so-called poison pill, which would be triggered if a person or a group's ownership of the firm reaches 10%. The sources, who requested anonymity as the discussions are confidential, cautioned that the talks with suitors including Emerson are subject to market conditions, and a deal is not guaranteed. Texas-based NI, formerly known as National Instruments, specializes in making automated testing and measurement tools to aid in research and validation of new technologies. In October, Emerson sold a majority stake in its climate technologies unit to Blackstone Inc (BX.N) in a deal that valued the business at $14 billion.

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