Measuring range 010mm 04 with graduation 001mm 0004 Strong 2 magnet surfaces with ONOFF control provides 176lbs 80kg Max Pull 30mm and up thickness metal countertopsurface required for 176lbs pull With fine adjustment knob for precise positioning Lug back included hole size 14 63mm 22 pieces test tips included in the storage case We are dedicated to ensuring your satisfaction If you have any issue during use please feel free to contact us our technical staff will reply and resolve the problem within 24 hours