Surface Roughness & Waviness Retrofit Perthometer PRK Note*-Machines displayed are Products/property of respective Manufactures. Machine Pictures used are to state compatibility of our Retrofit Packages only. "SeSurf" the retrofit package is compatible to other models of different manufacturers. Retrofit your existing Roughness Instruments with SeSurf an Inhouse developed Retrofit package comprising of Electronics and Software to suit machines for various manufactures. We have in the past developed customized solutions to meet various customer requirements and continue to do so. Our retrofit solution comes with 1 year of free warranty. Kindly contact us for system upgrades to suit your machine.