Observed arrival · 2026-10-13
FieldCharts: Trade References for the Job
Free, phone-friendly charts and calculators for HVAC, electrical, machining, and metal-and-pipe work.
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ƒJS
- For
- HVAC, electrical, and machine-work tradespeople
- Worth noticing
- Its listed references span refrigerants from R-410A to R-744, alongside tools such as a tap-drill chart and voltage-drop calculator.
Field notes
The references range from refrigerant comparisons and A2L guidance to AWG-to-mm² conversion, thread pitch, pipe schedules, and sheet-metal gauges. The homepage includes a methodology and sources section, plus a corrections link. It advises checking equipment or product manufacturers’ data before using any listed number.
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue