features : manual power on/off zero setting at any position metric/inch system interchange at any position with data output interface our productions : vernier calipers, dial calipers, electronic digital calipers,electronic digital depth gauges,locking-type(riveting-type)protractor, electronic digital thickness calipers, outside micrometers, electronic digital outside micrometers,dial indicators,the mold and so on. in order to adapt the market demand, our factory may manufacture according to the user’s request. for more informations ,please don't hesitate to contact me.