Cheap And Discounts SRT6100 Digital Surface Roughness Tester Meter Gauge SRT-6100 Range Ra Rz ISO DIN ANSI and JIS Standard Null Wholesale. Buy Directly From Merchant RaeSung Instruments & Meters Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.