Ohmen: Read the Ohms, Get the Metres

Field notes

The calculator uses resistance-per-metre values from a selected wiring standard, then adjusts for conductor temperature before producing a length estimate. Its modes cover single conductors, two-conductor loops, protective-conductor sizing, and test-lead compensation. A local log can retain conditions alongside a typed tag such as “Panel A”; the page says it uses no network client, GPS, or file-reading permissions. Results are explicitly presented as informative estimates rather than certified measurements.