# Journal — engineering notes from Milo

> Short, practical write-ups on hardware, firmware and shipping products.

- [Environmental testing on a small-batch budget](https://miloperovic.com/journal/environmental-testing-on-a-small-batch-budget.md) — 2026-10-06: A practical guide to environmental testing on a small batch: which temperature, humidity and drop tests to run in-house and which to book at a lab.
- [CMF design decisions that survive manufacturing](https://miloperovic.com/journal/cmf-design-decisions-that-survive-manufacturing.md) — 2026-10-01: A practical guide to CMF design for connected hardware: specifying colour, materials and finishes so the 500th unit matches the approved sample.
- [The five numbers a fleet dashboard should show first](https://miloperovic.com/journal/the-five-numbers-a-fleet-dashboard-should-show-first.md) — 2026-09-30: The five numbers we put at the top of every fleet dashboard, how we define each one, and why getting the definitions right matters more than the charts.