Resistor Tools is a handy iPhone app designed for hobbyists and electronic engineers. This collection of resistor calculators simplifies various calculations and configurations for resistors, making it an essential tool for anyone working with electronic circuits.

With Resistor Tools, users can easily calculate the resistance of two resistors in series or parallel. The app also provides the capability to determine combinations of two resistors in series/parallel to achieve a desired resistance. Additionally, users can calculate the ratio of R1/R2 and voltage divider, aiding in circuit design and analysis.

Furthermore, Resistor Tools enables users to find resistor values for creating voltage divider ratios and inverting amplifier gains. The app even allows users to save combination values in a CSV file, enhancing workflow efficiency for electronic projects.