Two advanced digital surface roughness testers with easy-to-read LCD display. The cost-effective, portable CV-R130 and R135 from CV Instruments operate in both Ra and Rz parameters, and each has a standard cut-off length of 0.8 mm, adjustable to 1-3-5 times, while the CV-R135 variant has an RS-232 output for data collection. Suitable for accessing awkward areas of components, the new instruments are supplied with an Ra roughness test plate and a tough carrying case. Tracers for special applications, a stable testing stand and a mini-printer are available as optional extras.