For auction I have a VIBRA-TAK TACHOMETER VIBRATION MEASURING SLIDE RULE GAUGE TOOL with original leather case! READS: FOWLER VIBRA-TAK PAT APPL. FOR MADE IN U.S.A. I do not know alot about this interesting vibration measuring device? T is no directions but I did get some info from their website which I will list below. Looks to be in excellent condition but is being sold as-is with original leather protective case. Would make a nice addition to any tool collection! If you have any questions please email me. Winning bidder pays 3.00 Flat Rate First Class shipping in the US. I will ship worldwide . Packaging and handling are free! Bid with confidence! Check my buyer feedback! Honest and Reliable! Speedy next day shipping! I will accept Paypal, Money Order, or personal ck. Please check out my other interesting vintage collectables I have or will be listing soon. In upcomming weeks I will be listing many unusual hard to find vintage tools, hardware and other items never before offered for sale or seen on ebay! Stay tuned... Check back often! Combine like items...save on shipping."SLIDE RULE" TACHOMETERS We are proud to bring to you VIBRA-TAK Vibration Tachometers! Precision built of high stress aluminum, practically indestructible, VIBRA-TAK is always ready for instant use by field men, engineers, or trouble-shooters! VIBRA-TAK has no intricate parts to get out of adjustment ... steel wire reed, with knurled tuning slide are the only moving parts. VIBRA-TAK tells in a moment how much and how fast an object is vibrating. Now you can check vibrators, internal combustion engines, turbines, etc. ... even the RPM of power lawn mowers. VIBRA-TAK is especially effective in determining the RPM of grinders-- w over speed is dangerous and under speed is inefficient. VIBRA-TAK Instantly checks ... Speed in RPM Vibration in CPM Equipment Efficiency Location of "dead spots" and unwanted vibrations Range: 2000 to 21,000 It's small size enables accurate readings to be taken even on hard-to-reach equipment. Deep-etched scale gives direct readings from 2000 to 21,000 ... higher speeds, register and can be closely estimated. VIBRA-TAK will not show RPM of completely vibrationless rotating parts and will not pick up speed of motors running under 2,000 RPM. To check RPM of internal combustion engines, remember the VIBRA-TAK vibration indicator gives the number of power impulses. Tfore, in a 2-cycle engine, divide the reading by the number of cylinders. When checking electric motors of vibrators, the instrument is read directly.