kr220 portable rechargeable digital surface roughness tester with testing 20 parameters

main feature: *electromechanical integration design, small volume, light weight, easy to use; *using dsp chip to control and data processing, high speed, low power consumption; *128 x 64 oled dot matrix display, digital / graphic display; highlight no perspective; *intuitive and rich display information, can display all the parameters and graphics; *compatible with iso, din, ansi, jis national standards; *residual quantity icon, prompting the user to charge