Pieffer Products creates Making Invisible Symptoms Visible, a universal, low-fatigue tracking system for people living with chronic or recurring symptoms. Designed for physical, psychological, and cognitive challenges, including undiagnosed conditions, the system helps users turn daily experiences into organized records they can share with clinicians, lawyers, or disability reviewers. It is intended to support documentation for processes such as SSDI/SSI reviews, but is not medical or legal advice.

The system avoids narrative writing: users set up symptom categories once, then record symptoms by circling, checking boxes, or answering guided questions. Its time-based method accounts for overlapping symptoms without counting the same hours more than once, and it includes a two-day grace period for missed entries.

Pieffer offers paper products, including a Core Ledger, Daily Refill Pack, and PDF Kit; Excel workbooks with automated scoring, dashboards, and charts; and an offline tracking app with guided questions and on-device data storage. Digital and paper formats can also be purchased in bundles.