This, "haystack needle" as they were called in Victorian times would have been used to check the temperature at the middle of a hay stack. Cut hay continues photosynthesis, producing Oxygen. If damp it starts to compost producing heat. Spontaneous Combustion ignites the hay. Railway and Ships go up in flames.
These haystack needles were used by the veterinary cops. Railway station masters and Army quater masters and fire service use them.
7 feet long
This could be American or English and could come from the dawn of railways.
VETERIARY
FIRE SERVICE
RAILWAY
FARMING
EQUINE 
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