Handheld surface roughness tester for external surface and grooves - Pocket-sized and economically priced! - External and internal finish testing with swivable tracer - Ra and Rz parameters in one instrument and all available after each individual test - Standard 9V battery - Standard cut-off 0.8mm, adjustable to 1-3-5 times - Piezo-electric pick-up stylus for external surfaces with diamond tip of 2 micron according to the latest ISO standards