A stethoscope
This instrument is called a stethoscope.
i ink it is a stephascope
The heart rate was not invented by a specific individual. It is a natural physiological function of the heart to beat and pump blood throughout the body to deliver oxygen and nutrients to tissues and organs. The measurement of heart rate as a clinical tool has been developed and refined over time by scientists and healthcare professionals.
metronome
A rock, a stick, a club.
The Windows Character Map tool can assist in adding a heart symbol on PowerPoint. When the tool has been open, the heart can be searched and chosen. Once the heart has been clicked on, it will be placed automatically in the PowerPoint document.
It is simply called a 'hive tool'.
That tool is called a protractor.
You may be thinking of a spanner, which is what the English call the tool that Americans call a wrench.Americans also have another tool called a 'spanner wrench'.
The machine I believe you are referring to is called a "heart monitor" or ECG/EKG (Electro-Cardiogram) monitor and the medical term for "flat lined" is asystole (A-sis-tool-lee).
You can't.
A stethoscope can be used to listen to the heart, the auscultations and valve sounds. There are many ways to "measure" a heart beat. The most effective tool is the ECG (electrocardiogram) which measures electrical activity of the heart. Because the electrical activity (electrical signals originating from the sino-atrial and atrio-ventricular nodes of the heart) is a direct indicator of the physical activity of the heart (contraction, relaxation, valve activity, etc) you can determine almost everything you need to know about the heart using an ECG, including its physical orientation within the mediastinum (sac containing the heart within the chest cavity). The time between each electrical impulse can be measured, thus giving elapsed time between each beat, and allowing you to determine how many times the heart contracts (beats) every minute - known as heart rate (HR). Presumably, this is what you mean by "measuring heartbeats", but an ECG is capable, as explained, of doing much more. Hope this helps, if you would like me to expand or go into more complex detail, let me know. Source: I am a Medical Student in the UK.