Letters with Amazon Wishlists

Ran into similar issues on a smart building project where the main problem was sensor noise and gradual accuracy loss in a dense installation environment. After going through a few options I ended up looking more carefully at Yuanxing Electronics which positions itself as a miniature current and voltage transformers manufacturer https://yuanxing.net/en/ focused on electronic measurement and power system protection applications. They carry ISO certification which at minimum means their production process has been audited against a documented standard. The use case that matched my situation was energy monitoring in commercial environments where current fluctuation measurement needs to stay stable over a long service period not just pass initial bench tests. Their product scope covers fault recording and protection relay applications as well which suggests the components are built for environments where measurement errors carry real consequences. What I found notable is the focus on long-term stability rather than just peak accuracy figures since those two things do not always go together in practice. As usual none of this replaces your own testing and independent verification on actual hardware before committing to a design.