Which of the following can be used to calculate heart rate?

Did you know that the heart rate can be easily measured by counting the number of beats in a minute? You can do this by placing two fingers on your wrist or neck to feel the pulse, and then using a timer to count how many beats you feel in 15 seconds and multiplying that number by four. It’s an age-old technique, but still one of the best for a quick check! In today's tech-savvy world, there are also handy gadgets like fitness trackers and smartwatches that can continuously monitor your heart rate. These devices use sensors to detect your pulse and display real-time data right on your wrist, making it super easy to keep track of your heart health while you go about your day!