I highly recommend the Maximatcher; I find that the results correlate well with other tube testers that I also use.
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bob..dave smith here..i could not find an email address on the isoclean add so i looked up one of your previous posts....i greatly appreciate your letting me try them..that is very kind of you. what is your paypal account address and i will paypal you the $100 plus $25 which is what the calculated UPS 3rd day changes are according to the add..thanks again..dave..my address is dave smith..300 thistle trail..danville,va. 24540..434-7241574...my email address is ..firstname.lastname@example.org