English composition
posted by John .
I bought a pedometer on the Auction site online, so I can measure my steps. If I walk for 10,000 steps a day, it will be helpful for my health. This product was made in China, and it is 1,500 won. It is inexpensive. Because I can check how many steps I can walk, it will be useful to take care of my health.

Would you check my composition and let me know what expressions are in correct? Thank you.

In the second and the fifth sentences, the words "it" don't seem to refer to any particular noun; that is, the antecedent is not clear. Those sentences need rephrasing  perhaps like this:
Walking 10,000 steps a day will be helpful for my health.
How can you rephrase the fifth sentence so there is no vague "it"?
In addition, I'd do something different with "It is inexpensive." That sentence seems to chop up the paragraph. Try rephrasing and attaching it to the sentence before it.
Let us know what you come up with.
=) 
I bought a pedometer on the Auction site online, so I can measure my steps. If I walk for 10,000 steps a day, walking with the pedometer on my belt will be helpful for my health. This product was made in China, and it is 1,500 won. The pedometer is rather inexpensive. Because I can check how many steps I can walk, the item will be useful to take care of my health.

Thank you. I corrected some expressions, would you check them,please? 
Yes, it's better. How about this, though, for the last sentence:
Because I can check how many steps I walk each day, the pedometer will be useful as I take care of my health.
"... useful to take care of ..." is not standard phrasing.
=)
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