I&E Bench
4-20
Signal scaler
Map 4-20 mA (or custom ranges) to engineering units with live percent of span.
Offline calibration tools for iPhone and iPad
Calibration Calculator
for I&E technicians
Fast, on-device math for signal scaling, Ohm’s Law, and voltage drop. Built for instrumentation and electrical work. Clean, offline-capable, and ready on iPhone and iPad. Optional iCloud sync for saved work.
Free at launch
Free core Catalog tools
Free tools stay free. Calculations run on your device, with no Walker United Group account. Optional iCloud sync keeps saved work in your private iCloud when you want it.
Ω
Ohm’s law
Solve for voltage, current, resistance, or power from any two known values.
ΔV
Voltage drop
Estimate drop across wire runs and get a clear warning when it exceeds 5%.
°C
Unit converters
Temperature units, Pressure units, Flow units, and AWG ↔ mm² / CM.
Tube
Tubing & conduit (free)
Tube bend allowance & gain; Tube length between fittings; Conduit offset, kick, shrink; Stub-up / back-to-back.
Log
Calculation history
Recent calculator inputs and results on device (free tier).
Designed for the field
Dark by default, light on request
Tap Signal, Catalog, or Settings. Screens below are HTML mockups of the app UI (not simulator captures). The app opens in dark; turn on Light Mode in Settings for light.
HTML mockups. App opens in dark by default; Light Mode is a Settings toggle.
iPad
iPad Pro layout (HTML mockups)
On iPad the app uses a sidebar (NavigationSplitView). These are HTML mockups of that layout, not simulator captures. Dark default.
I&E Bench Pro
Lifetime unlock for the tools that go further
$19.99 one-time · no subscription
Buy once through Apple. Restore on any device signed in with the same Apple ID.
- RTD Pt100, RTD Pt1000, Thermocouple
- 5-point calibration worksheets (configurable point percents)
- Tube saddle; Tubing working pressure; 3-point / 4-point saddle; Multi-bend layout
- Instruments / tags
Pro unlocks RTD/TC, advanced tubing & conduit, worksheets, and instruments. Core calculators stay free.
Optional iCloud sync for saved work uses your CloudKit private database, and the developer never sees it.
