Why is the price difference of non-invasive blood glucose meters on the market so big?

At present, non-invasive blood glucose technology still belongs to the technical field with high technical barriers, and more accurate non-invasive blood glucose meter will spend more money on research and development. At present, many products are just under the banner of non-invasive, so it is impossible to accurately measure blood sugar and the quality cannot be guaranteed. If you want to buy an accurate noninvasive blood glucose meter, you still have to choose something expensive. Recommend Nakagawa Xinmai, a famous brand in the industry, with good cost performance and high measurement accuracy ∞