Questions, bug reports, calculation clarifications, or payment help — email us and include the email you used at checkout if it's about a purchase.
trenchmasterpro@gmail.comBought the lifetime unlock but got a new phone or cleared your browser? Open the app, tap LOCK RUN until the unlock screen appears, then use Restore Purchase with the same email you used at checkout. Your unlock is tied to that email, not the device.
Tap EXPORT GRADE SHEET PDF, then Download PDF in the preview. On a phone you can also tap Share to text it to your crew. If a desktop browser blocks the download, use Print and choose Save as PDF.
Once the app has loaded, the calculator, grade sheet, and PDF export work without a signal. Your inputs and free-run count stay on the device. You only need a connection to buy or restore the unlock.
The $4.99 unlock is a one-time purchase — no subscription. Checkout may add local sales tax on top of the listed price depending on your location. Receipts come from Paddle, our payment provider. Email us with your receipt email for refund requests.
Trench Master computes True Slope = (Total Drop / Total Run) × 100 and Height of Instrument = Benchmark + Rod Reading. Quick mode uses rod readings (higher reading = lower point). Always verify grades with a calibrated level before laying pipe.
IMPORTANT FIELD DISCLAIMER: Trench Master is a field estimation tool designed strictly to assist with calculations. Users must manually verify all physical grade elevations, laser alignments, and invert measurements with a calibrated engineering level prior to placing bedding stone or laying pipe. The developer assumes zero liability for construction layout errors, structural defects, re-excavation costs, or field installation mistakes resulting from the use of this software.