Based on previous excellent experience, I ordered SW-200, but was mistakenly sent a CW-200 pedometer. This newer model has a built in clock which automatically reverts to zero at midnight, a frustration to me when I neglected to get a reading late in the evening–and a major problem for nurses and others who work at night I imagine.
I had a rapid email exchange with Yamax customer service in Japan which informed me that the SW-200 was still available. I had very satisfactory service with Amazon in returning the CW-200 and receiving a full refund, and ordering and receiving an SW-200. I wore them both for a day before sending the CW-200 back. Each one counted my steps exactly when I walked 100 and 200 steps. There was some variation in counts when I was moving around the house, doing miscellaneous errands, etc. which is not a problem as far as I am concerned.
I highly recommend this simple pedometer over the ones with various bells and whistles features.

LATER–I dropped and broke this pedometer 12 weeks after I got it. The information that came with it said “Call if your pedometer needs repair 888.339.2067” I called the number and an individual answered and walked me through the steps needed to repair it. In 10 minutes is was as good as new.
A MAJOR ADDITIONAL PLUS.

I have been using the Digi-Walker sw-200 since 2003. It was recommended to me by people at the Boulder CO Center for Sports Medicine. Is is so simple to use, a no frills, uncomplicated little thing. I just make sure I walk 10,000 steps a day (5 miles) and this little device is perfect. Just press the reset button and you can start over the next day. I have used it with a hand-held GPS to check the accuracy – and found it to be accurate in how many miles I go.

After having bought a pair of pedometers the year before and finding that they gradually seem to become more erratic, we did a significant amount of research trying to find a pedometer that was not exorbitantly expensive yet accurate. My wife and I have been using these every day for several months and have been very pleased. Does exactly what we wanted, does it well, and was very inexpensively.