| thats what I found Nelly, when i first got mine I inserted the No.5 button and we tried it on my mate Dallas's 748RS on which he had just had the belts tensioned by Brancato, after getting the wron reading I swapped to the No.4 button and got the correct reading, I put it down to the belts containing Kevlar in their construction but there is probably some other reason.
Kev | 
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