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Early blood glucose meters used the glucose oxidase colorimetric method. The test strip reacts with blood, changing color. After a set time, the bl...

A blood glucose meter, also known as a blood glucose meter, is an electronic instrument used to measure blood glucose levels. Blood glucose meters ...

Mercury sphygmomanometers. There are two types: tabletop and standing. Tabletop mercury sphygmomanometers are structurally sound and reliable; stan...

In 1628, English scientist William Harvey observed that when an artery was cut, blood gushed out as if driven by pressure. Blood pressure could be ...

Box-type hearing aids, also known as pocket-type or miniature hearing aids, are slightly larger than a matchbox. The main unit and earpiece are con...

A hearing aid is a small amplifier that amplifies sounds that are otherwise inaudible. Utilizing the residual hearing of the hearing-impaired perso...

A basal body temperature thermometer is used to measure a person's body temperature immediately upon waking in the morning. Compared to daily body ...

The working substance of a clinical thermometer is mercury. Its bulb has a much larger volume than the capillary tube above it. Due to the influenc...