Cambridge Primary (1-6). Stage 6. Science. Learner's Book - Unit 1: The human body - Question 107

Marcus and Arun measured the pulse rates of some of their friends before and after exercising for three minutes. These are their results.

| Name | Pulse rate before exercise | Pulse rate directly after exercise |
|---|---:|---:|
| Marcus | 91 | 120 |
| Arun | 88 | 122 |
| Jamal | 90 | 128 |
| Kai | 89 | 125 |

What equipment did they need to measure the pulse rates?