An electrical pipette that includes an adjustment wheel, which comprises a primary spring defining a first adjustment area and a secondary spring defining a second adjustment area after the first adjustment area in a turning direction of the adjustment wheel. The force required for turning the adjustment wheel within the first adjustment area is smaller than within the second adjustment area, and the springs are arranged to return the adjustment wheel to its original position when the adjustment wheel is released.

A computer mouse that includes a plurality of tunable switch assemblies is disclosed. According to certain embodiments, the tunable switch assembly comprises a plurality of tunable switches and a rotatable wheel casing that houses the plurality of tunable switches. Each tunable switch of the plurality of tunable switches is distinct from any other tunable switch in the plurality of tunable switches in a given tunable switch assembly of the plurality of tunable switch assemblies, according to certain embodiments.

The rotary dial apparatus of the present disclosure includes: a housing; a dial being rotatably held relative to the housing; a magnet rotating in accordance with rotation of the dial; and a magnetic sensor disposed in the housing and detecting rotation of the magnet. The magnet and the magnetic sensor are disposed in different regions from each other with a wall being interposed between the magnet and the magnetic sensor.