In Too Tolerance

This application is an electronic circuit Calculator for digital circuit engineers and embedded system programmers. It is my desired application from my past work experience.
It equips limited simple calculations necessary for digital circuit operation check.
* Serial / Parallel calculation of the electronic parts. Ohm's law. Time and frequency conversion. All calculation's variation ranges.
* Digital circuit calculation of H/L level by the resistance of the actual circuit. Conversely, calculation of resistance that fills the specifications.
* Digital circuit calculation of H/L level at the read timing curved by the capacitance of the actual circuit. Conversely, calculation of capacitance/resistance that fills the specifications.

It equips User Interface suitable for Touchscreen. (Direct touch to displayed number works as number input or modification, or switching between result and input.)

(Spec)
・Serial/Parallel of electronic parts, Ohm's law or Time and frequency conversion consist of 2 sheets × 2 pairs.
・Resistance voltage level sheet. Capacitance/resistance voltage level sheet.
・Number input and modification by direct touch action to the digit you want to change. In re-calculation of slight changes, entering full number is not necessary.
・Number input in keyboard sheet with keys that according to the number type to input.
・The direction of calculation is switchable by touch. Inverse calculation, changing result field to input, is easy.
・Calculation result is automatically done at the time necessary inputs reach.
・At the pressed moment of the key, the key function is shown display. (Not the released moment.)
・Lock of each number is possible.
・Internal calculation: 16-digit decimal or fraction, independently developed (Not binary floating/double)
・Display number length is selected from 10/14-digit depending on screen size.(SI Prefix uses 1digit.)
・2 sheets can be parallelly shown and operated if screen size is larger.
・Copy / paste function of a each number and a sheet.
・1 memory
・Circuit diagram sheet is independent to calculation sheet.
・Configurable rounding location classified 2 kinds, rate/quantity.
・Metric units are switchable from using metric (SI) prefix of -2,-1, 1, 2 exponent or not, or exponential number.
・Selectable decimal point/separator character(5) and separator position(4), and number character(19).
・Automatic save of the calculation state at the application termination.
・Whole initializing. Or returning to the state at the time application started.
・Dark theme(Android10)