OMC provides a product selection assistance service for non-contact distance measurement techniques. The devices in our database can vary from tens of metres to a few microns in range while the speed of measurement may be as fast at 500 thousand per second. The techniques may measure in one dimension only or provide a full 3-D measurement capability. The methods available vary from those using light to sound, from interference and time of flight to triangulation. An instrument costs vary considerably from a few pounds to many thousand pounds.