Fineness gauge Grindometer Fineness of Grind ISO standard one channels 0~25;0-50;0-100;0-150 (0-150) PU-2411\0-25umPU-2412\0-50umPU-2413\0-100umPU-2414\. Please tell us which one you need PU-2411\0-25um PU-2412\0-50um PU-2413\0-100um PU-2414\0-150um