Vintage Smiths Venture ATH3 Hand Held Analogue Tachometer in Box. I haven't a clue what it does but it feels heavy and looks important 🤷♂️ My Dad was an engineer so something to do with that I guess. Please forgive me dad for not knowing it's true purpose Lots of others on ebay up to £100 but I'll take £50 if anyone wants a bargain
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