JO401演示電表是根據新的教學大綱，為普及九年制義務教育而設計的新型演示電表，可用于測量直流電流、直流電壓、也可作檢流計用，是教學中研究磁電系電表結構的直觀教具，該表有良好的直觀性，高的可見度，操作方便，結構合理，采用優質磁鋼的內磁結構。使儀表的磁性穩定，靈敏度高、重量輕、攜帶方便，表頭采用硅二級管保護電路，可防止過載電流損壞電表，而且具有價廉、物美、質好的特點。

The JO401 Demonstrating Galvanometer is an ideal visual aid specifically esigned according to
the devised educatble schema for the 9-years compulsory educational plan .besides working as
galvanometer,it is suitable for measuring educational plan.provides such excellence as magnetic stabiliry,high accuit which can prevent damages from overloading .other excellence can be listed as following;visual convenience,openness easily to control, excellent arrangement high and cheap in price etc.