Kennametal BestSPEED Dynamically Preferred Speed Analyzer Model- KTT100C Here it is and here it is for Cheap! This is a very rare, sound tester for metal working. this comes with the unit, manual, case and power cord (note- the power cord is a little loose plugged in, but powers the unit) Condition -Near mint condition. No real signs of use. Here is the info from the manufacture website: "A BestSPEED dynamically preferred speed analyzer from Kennametal measures chatter sound from unstable machining processes using a non-contact microphone. The battery operated, hand-held unit then recommends dynamically preferred speeds to reduce the chatter. These speeds result in phase-locked vibration control that eliminates the regenerative cause of chatter. ?" Also -here is a link to a good article relating to this product : www.mmsonline.com/articles/chatter-control-in-a-box **Please note I am in the military reserves and sometimes get called away for duty. I will try my best to ship ASAP, but sometimes there may be a few days between when you pay and I ship. Please ask more questions if you have them Will ship international.