<P>Swiss precision instrument manufacturer Zehntner offers a variety of retroreflectometers for measuring the visibility of road markings, including three portable models: the budget-priced ZRM 6006, the classic ZRM 6013 and the professional-grade ZRM 6014, as well as the vehicle-mounted ZRS 6020.</P>
<P>The user-friendly entry level ZRM 6006 features one button operation for measuring day or night visibility of road markings as well as ambient temperature, while the ZRM 6013 includes a memory for determination of night visibility and day visibility of road markings and ambient temperature.</P>
<P>The vehicle-mounted ZRM 6020 is capable of measuring road marking visibility at speeds up to 150 km/h (93 mph) without obstructing traffic.</P>
