Mandina's Inspection Services introduces UltraCal on android:

UltraCal is a NDT calculator that consists of 12 popular formulas used in industrial Ultrasonic Inspection. This app's formulas are perfect for personal use and for those taking upcoming inspection examinations. One can make their own test questions and check the answers using UltraCal (velocities are in metric and US standard).

You will be able to calculate:
1) Wavelength
2) Near Field
3) Half Beam Spread
4) Amplitude Comparison
5) Acoustic Impedance
6) Percent Reflection
7) Depth Calculator (sound path)
8) Snell's Law
9) Angle Beam Set Up
10) Angle Beam Flaw Location
11) AWS Indication Rating
12) TOFD PCS