$ probing for tools that don't quite exist as a set anywhere else 

Switch between reading a resistor's bands and finding the bands for a target value.

Enter exactly two known values and clear the others, then solve.

Standard series RC charging network.

Estimates minimum copper trace width for a given current and allowed temperature rise.

Fill Vin, R1, R2 to get Vout — or fill Vin, R1, Vout and leave R2 blank to solve for it.

Enter the marking printed on a ceramic or film cap, like 104 or 47.

Ballpark figures for chassis wiring, not a building-code ampacity table.

2.4GHz channels are 5MHz apart but ~22MHz wide, so most of them overlap. Only 1, 6, and 11 are fully clear of each other.

Safe up to 2^53 — this is a bench tool, not a bignum library.

Uses your mic as a live signal source — hum, whistle, tap a coil to a speaker, or clap and watch it on the trace. Audio stays in this tab; nothing is recorded or sent anywhere.

A basic function generator through your speakers or headphones — handy for testing audio gear, piezo buzzers, or your own hearing range. Starts quiet on purpose.