As Ian (ITPRO) explained the Mychron kit is light years ahead of the Alfano Pro & Pro2 models with loads more expanadbility via the E box or the GPS module. However if you go down this route be prepared to be swamped with data unless you are in the luxurious position to have a PC savvy data engineer in your awning to interpret all of the info available. Also as Chris 34 pointed out there is little difference in the new or second hand price, £30 more expensive for the Mychron 4 than a current Alfano ProV2. The only other options realistically are Unipro & PI systems which also have excellent data acquisition and PC software, but these also come with a price tag!
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