He was hiding the fact that he was an illegitimate child.

I'm sorry, but I don't speak Japanese.

I'm a Muslim, so I fast during Ramadan.

I'm Jewish.

I use a pedometer every day to record the distance I walk.

I wonder where my sphygmomanometer is?

He measured muscle activity using an electromyograph.

The doctor used an electrocardiograph to check the condition of my heart.

I check my step count every day with a pedometer.

Let's use a radiation dosimeter to measure the radiation levels in this area.