smart board markers replacement.As far as the current application status in the field of education is concerned, the interactive whiteboard of electromagnetic induction technology has relatively accurate positioning and pressure in the writing process (that is, the thickness of the handwriting is different according to the weight of writing), and the uniformity of the display area is relatively Good advantages occupy a fairly stable education market share, such as Promethean and GTCO in the UK, SMART in Canada, Numonics in the US, iqboard in China, etc., are the main manufacturers using this technology. The interactive whiteboard of infrared technology is not popular enough in the classroom teaching because of its weak sense of pressure and the vulnerability of infrared rays to the learning experience. The interactive whiteboard of resistive film technology shows a trend of decreasing market share year by year due to its easy scratching and difficult writing. Therefore, in order to meet the needs of writing, the interactive whiteboard based on electromagnetic induction technology in the following pages is simply referred to as an interactive whiteboard.