Electronic sphygmomanometers are all based on the principle of oscillometry, and Omron's is no exception. Is it accurate? Will it be used correctly at first glance? Some people chat, some people measure. Even if you go to the hospital for a mercury test, the doctor will knock you on the head. Second, look at the sphygmomanometer. You get what you pay for. All you have to do is buy a sphygmomanometer for forty or fifty dollars. I really don't think being a trade union is any better.