Process Sensing Technologies, a portfolio company of Battery Ventures, agreed to acquire SST Sensing, a global provider of oxygen-measurement and liquid-level sensors. Financial terms were not disclosed. SST’s products help improve product quality; protect the health and safety of operating personnel and their production environments; and preserve capital equipment and investments by optimizing operating efficiencies. “SST’s strong technological reputation for oxygen measurement is highly complementary to the other businesses in PST’s portfolio, and the company will broaden PST’s existing oxygen-measurement portfolio to include zirconium oxide and optical-sensing capabilities.” Adam Markin, PST Group CEO.