I saw a number of them that I did like, had certs and starting at about $900 bucks.
Some worked beautifully and others were less than superb in their ability to read RPM.
That was what I was expecting from this price range and also trying to avoid the "less than".
The ones from MPJA for $40 or $50 bucks looks promising, but I did not see any specs as to error, however, how could I check the accuracy even if it did have specs, would need to purchase that $900 certified unit to see if it was accurate or not. For my needs, that $40 unit should be plenty accurate.
Thanks for the input
Ken