Krave Antiques has dated this piece to the 19th Century.
The whole piece has a wonderful patina and is marked with the maker's name Dring & Fage Makers Tooley St London.

Dring and Fage were manufacturers of hydrometers, instruments used to measure the strength of alcohol and instruments used to calculate excise duty. Dring & Fage were at Tooley St London from the late 18th century into the 19th century.
Total length: 136 cm (53 1/2").
Folded length: 26 cm (10 1/2").
Condition: Excellent antique condition with signs of use in keeping with age. A wonderful patina and no breaks or damage.
Krave Antiques has dated this piece to the 19th Century.
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