Soil Resistivity checker

Know whether a soil resistivity traverse is good before you pull the pins. Type in your readings, or scan the field sheet, and Soil Check fits a layered soil model in about a second. It gives the RMS error and a plain verdict, and points straight at the reading that doesn't fit. Re-measure one point on the spot instead of sending a crew back. BUILT FOR THE FIELD • Wenner and Schlumberger (c = C1–P1, d = P1–P2) • Enter readings exactly as the meter shows them, with an optional range-multiplier (Factor) column • Spacing templates for 20 ft, 100 ft and metric traverses • Feet or metres; Ω·m or Ω·cm • Works offline, anywhere AN ANSWER, NOT JUST A NUMBER • Excellent (RMS under 5%), Good (5–10%), Acceptable (10–20%) or Redo (over 20%) • Log-log plot of measured apparent resistivity, the fitted curve and the soil model • Auto-fit tries one to four layers and adds a layer only when the data justify it • Flags points off the curve and tells you what the RMS would be without them • Catches the classic slip, a ×10 multiplier written where ×1 was used, with a one-tap fix • Compare two directions at one site, and get a warning when they disagree A MODEL YOU CAN TRUST The forward model and the RMS definition were checked against soundings interpreted in professional soil-analysis software. Soil Check reproduces that software's RMS error, matches its computed curves point by point, and its auto-fit chose the same number of layers in all eight test soundings. SOIL CHECK PRO: ONE PAYMENT, NO SUBSCRIPTION • Scan a field sheet: photograph the paper form and the readings are filled in for you to check against the handwriting. The photo is read on your iPhone and never uploaded. Anyone can try it on the built-in sample sheet. • Fit by hand: choose up to five layers, set a starting model, lock the values you know, and compare attempts. • Export: PDF site reports, CSV spreadsheets, and F05 input files for professional soil-analysis software. FREE, PRIVATE, NO ADS • Everything not marked Pro is free, and stays free. • No account, no ads, no tracking. Your sites, readings and sheet photos stay on your iPhone. Soil Check is a field screening tool. Soil models for grounding or AC-interference design belong in professional software, prepared by a qualified engineer.