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Either the LTi 20-20, prolaser 2 or 3 cost a fortune to purchase, thats if they would sell one to Joe public. The police/cps wouldnt want people testing these devices and finding that they all suffer from slip error!!
I had an old HSS Hire catalogue ,and you used to be able to hire them and also a large digital speed display. I'm going back a good few years, but might be worth a shot!!