description

photo/contact tachometer, pocket type
model : dt-2230
* mini pocket size, easy carryout.
* photo tach. : 5 to 100,000 rpm
　contact tach. : 0.5 to 19,999 rpm.
　surface speed : m/min, ft/min.
* laser beam for photo tachometer, long 卡塔尔世界杯中国足球赛事 distance.
* lcd display, rs-232 interface.
* patented.
* dc 1.5v battery (um-4, aaa) x 4.