Did you get the same blood pressure reading manually as you did with the use of probes? provide at least two reasons these values may be different.

The result will be different if you will get the same blood pressure manually and by use of probes. Below are the reasons:

1. different result is because of machines are more sensitive than manual
2. It will also depend on when the pulse starts and stops, meaning the timing in getting a blood pressure. 

Depend on others just like they said