Should I Buy a Water Activity Instrument or Use an External Contract Laboratory?

This practical decision calculator helps QC and quality teams estimate when an in-house water activity instrument can pay back compared with routine testing at an external contract laboratory. Enter your own sample volumes, laboratory fees, internal effort, service costs, useful life, and financing assumptions to see the expected break-even point, payback time, and total savings.

Beyond the direct cost comparison, in-house water activity testing can also support faster release decisions, shorter feedback loops in production, better process control, easier trend monitoring, reduced dependency on external turnaround times, and stronger internal know-how. These qualitative benefits can be especially relevant when water activity is used for microbial safety, chemical stability, shelf-life decisions, or maintaining texture and product quality.