Glass Gerber hydrometer
1900-1960
Mercury in glass lactometer, in case
1830-1920
Hydrometer, mercury in glass lactometer, with case
1830-1920
Glass lactometer
Lactometer or Milk Tester (dated 1869) by MOTTASHEAD & CO
1869
Glass lactometer
1850-1920
Lactometer.
Lactometer, in case, by Chevallier, French
11 c.c syringe for milk testing apparatus
Lactometer in a blue leatherette cardboard tube case for milk testing apparatus
Glass lactometer in case
Lactometer, glass, in cardboard container
1901-1930
Quevenne type special lactometer
Lactometer, glass, in cardboard slipcase, c. 1900.
1900
Lactometer, commercial grade graduated in specific gravity and equivalent milk scale
Glass lactometer
Glass lactometer, England, 1875-1900
1875-1900
Lactometer, in case, French (Crellin 106)
Galactometer with case
Flask for milk testing apparatus
Thermometer for milk testing apparatus
Four butyrometers in wood stand for milk testing apparatus
Lactometer, glass, in cardboard container
1901-1950
Glass lactometer with paper scale
Lactometer, British Standard 734. Range 1.025 to 1.035 g/ml. G.H. Zeal Ltd.
Glass lactometer by unknown maker
1900-1960
Lactometer, made by Dairy Supply Co
1910-1950
Hydrometer, mercury in glass lactometer
1801-1830
Lactometer, mercury in glass
1830-1920
Glass lactometer with integral thermometer with case; scale inscribed 15-45
late 19th century