Caliper App, developed by caliper.dev, is a free Chrome add-on that allows users to measure ECG (electrocardiogram) diagrams with precision. With this tool, you can use electronic calipers to make accurate measurements on images of ECGs.

The app offers different types of calipers to cater to various measurement needs. Time calipers enable you to measure intervals or heart rate, while amplitude calipers allow you to measure voltage. Additionally, angle calipers are available for specialized uses such as evaluating QTc values and RR rate.

One of the key features of Caliper App is its recalibration capability, ensuring accurate measurements at all times. Moreover, the app supports zoom functionality on all pages, allowing you to closely examine and measure specific areas of the ECG diagram.

For those looking to learn more about ECG, the app provides a link to the Wikipedia page on electrocardiographs.

Overall, Caliper App is a valuable tool for medical professionals, researchers, and students who need precise measurements on ECG diagrams. It is easy to use and provides the necessary features to analyze and evaluate ECG data effectively.