This one. I bought it new in 1984 and have used the snot out of it for 35 years. If it ever fails, then I will buy a different one since the company that made it went out of business 20 years ago. :D
But it has a lifetime warranty??
There's an old man that sells tachometers at the swap meet and he gives lifetime warranty... He's at least 90 and all I can think is " who's lifetime?!!"