Write in English and include your phone model. If a purchase failed, also include the store you used, Apple or Google.
Open the bend that is locked and tap Restore purchase. Use the same Apple ID or Google account that paid. The phone needs a connection for that step.
The price in the store is the price you pay. It is one payment of $4.99. There is no subscription to cancel.
Offset and saddle numbers follow the multipliers printed on a Klein bender card, rounded to the nearest 1/16 inch.
On Stub 90, the mark uses the take-up stamped on your bender. If that stamp is not 5, 6, or 8 inches, choose Custom and enter the stamp. The stamp wins.
After PipeMark is installed, the calculations run on the phone. A basement with no service does not change the marks. Only buying and restoring need a connection.
Each bend includes 3 free calculations a day. Opening a screen does not use one. The first change you make does. More changes on that same visit do not. The next day starts over. One purchase removes the limit on all three bends.