InsToolBox

InsToolBox brings together in a single app the calculation tools that every instrumentation and industrial electronics technician uses daily — without depending on the internet, without ads, and without collecting any of your data.

✅ Linear and bilinear interpolation, with illustrative graph
✅ Pressure converter (Pa, kPa, MPa, bar, mbar, atm, psi, kgf/cm², mmHg, inHg, kgf/m²)
✅ Temperature converter (Kelvin, Celsius, Fahrenheit) with three synchronized fields
✅ PT-100 converter (resistance ↔ temperature), Callendar-Van Dusen curve according to IEC 60751
✅ Thermocouple converter (types J, K, T, E, N, R, S, B), official NIST ITS-90 tables
✅ Number base converter (decimal, binary, octal, hexadecimal), with support for negative numbers
✅ Simple, direct and inverse rule of three
All results are calculated automatically as you type — without needing to press any calculate buttons. Clean interface, fields with clear visual highlights, and fast navigation via a side menu.
100% offline: none of the tools depend on an internet connection, and the app does not collect, store, or send any of your information to any server.
Ideal for instrumentation technicians, electricians, engineers, automation students, and any professional who needs fast and reliable technical conversions in the field.