I had a Omron Model HJ-112 Pedometer that I have now passed on to Betty. I like it because I felt it gave an accurate count of my steps and it would store and display 7 days of data. I found the user manual for it online here
in case instructions are needed. I have it set to a 26" step.
Here is the most useful page in the user manual.
This is probably all you will need to know to use this. I always clipped it on my waistband in the morning and just wore it all day.