釣り師の単位変換 is a free iPhone app designed for anglers who need to convert various units used in fishing. The app offers three types of conversion functions: weight, line (thread), and length.

In the weight conversion section, users can convert between different units of weight for fishing, such as ounces (oz). The app provides a list of corresponding fractions for oz, including 1/96, 1/64, 1/32, and more. Users can input any value in these fractions, and the app recognizes the numerator value. However, the app does not automatically simplify the fraction.

The line conversion section allows users to convert between "PE numbers" and "lb" units. The relationship between PE numbers and lb is PE number x PE coefficient = lb. The app provides an adjustable PE coefficient, with an initial value of 16. Users can input their desired PE number, and the app calculates the corresponding lb value based on the coefficient.

Lastly, the length conversion section allows users to choose between Japanese or English representation. The app provides a field for inputting the length in feet and inches, where 12 inches equals 1 foot. For handling decimal inches, users can utilize the inch field.

Overall, 釣り師の単位変換 is a handy tool for anglers who need quick and accurate unit conversions for their fishing needs.