Magnetic Drawing Board yog ib qho kev sib tham me nyuam cov khoom ua si tsim los siv cov qauv sib nqus, muaj nyob rau hauv ob lub cev thiab hluav taws xob.
Lub cev version siv cov hlau nplaum nyiam cov xim, tso cai rau kev tsim dawb thiab luam tawm, ua rau nws tsim nyog rau kev mus ncig. Cov khoom siv hluav taws xob muaj ob - xim rau sab, tsim los tsim cov menyuam txoj cai- lub hlwb kev txawj ntse thiab tsim kom muaj tswv yim thiab kev xav. Kev ceev faj yuav tsum tau siv txog kev pheej hmoo ntawm nqos cov hlau nplaum; yuav tsum tau saib xyuas niam txiv.
