Wires and cables.
Sizing conductors and runs: a calculator, wire size by current, cable length, voltage drop, core colors and marking decoder.
Andrey Pisarenko.
Notes and reference material I keep for myself - cycling, cars, airsoft, electrical work. Converters, calculators and tables.
Electrical
Breakers and protection.
Circuit breakers, RCDs and earthing: trip curves and markings, RCD selection, grounding calculator and Ohm's law.
Power bills and electronics.
What an appliance costs to run at Belarus tariffs, LED bulb matching by lumens, resistor and capacitor markings.
Garage
Owner's handbook.
Renault Mégane II maintenance tables: tightening torques, fluids, bulbs, spark plugs and tyre pressure.
Tyres, fuel, oils.
Universal calculators and references: tire size comparison, ratings, fuel costs with pump prices and oil marking.
Bolts and nuts.
A general reference for M3-M22 metric fasteners: tightening torques and wrench sizes.
Hobbies
Gears, pressure, routes.
Calculators for picking the right gearing and tire pressure - they work offline.
Energy and ballistics.
Muzzle energy versus BB speed - a reference for weights from 0.20 to 0.48 g.
Tools
Currencies, dates, passwords.
A currency converter at NBRB rates, days between dates, a password generator and QR codes - all in your browser.
Working with text.
Fixing text typed in the wrong keyboard layout, transliteration, case conversion and a character counter.
Renovation
Wallpaper and paint.
How many wallpaper rolls and paint cans a room needs - accounting for pattern repeat, coats and openings.