Casio fx-61F Electronic Formula 27 Calculator
My old trusty Casio fx-61F “Electric formula 27”¬†calculator is still going strong and gets regular use. It was bought in a sale from Maplin [...]
Digital multimeter calibration for voltage, resistance and current
I got a little carried away with this one! I have an old multi-meter whose calibration was unknown. Surely an accurate voltage reference would help with [...]