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Proses Slot Car Track Voltage Tester for 1/32 1/24 Scalextric Carrera Bachmann 2.9 Wheels CVA axles are a wearProses Slot Car Track Voltage Tester for 1 43 1 32 1 24 Voltage tester for Slot tracks, both at 1: 43, 1: 32 and 1: 24 scale. This Proses tester, based on those used by the brand in its range of railways models accessories, not only allows to check if there is voltage on the track if not how much. Led indicators light up for 5 to 9V, 9 to 12V and +12V. It's design allows the use in most marketed analogue and digital slot tracks.