Which scientific product design innovation was specifically created to address the problem of parallax error in measurement readings?

The intersection of science and product design has led to revolutionary innovations that have changed how we interact with everyday items. This poll explores how scientific principles have been incorporated into the design of common laboratory equipment to improve functionality, accuracy, and user experience. Test your knowledge about the evolution of scientific product design and the thoughtful engineering behind laboratory tools we often take for granted.

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The meniscus reader on graduated cylinders
The rubber bulb on pipettes
The digital display on electronic balances
The color-coded tops on microcentrifuge tubes