September 18, 2026

Delmhorst Instrument Co., a U.S. manufacturer of precision moisture-measurement instruments widely used across the restoration, building trades, lumber, and agricultural industries, has announced its acquisition by Nielsen-Kellerman (NK) of Boothwyn, Pennsylvania. The sale marks the end of 64 years of Laurenzi family ownership and the start of a new chapter for the 80-year-old brand. Founded on William Delmhorst’s original meter design to trace building leaks and later guided by Aristide Laurenzi’s vision, Delmhorst has spent eight decades building U.S.-made instruments for moisture detection, production, quality control, and inspection. Its moisture meters are a fixture