$325

RARE Improved Robertson-Thompson Steam Engine Indicator

$35

Antique Oak Hoyt Electrical Instrument Working Voltmeter

$56.99

VINTAGE HERSEY MECHANICAL WATER LEVEL INDICATOR! LOOKS UNUSED! EASY TO READ!

$10

Horse Chestnut Microscope Slide

$842.71

VINTAGE JEWELL ELECTRICAL INSTRUMENT CO. VOLT METER GAUGE 0-6V

$195.27

Circa 1890 French Concave Distortion Mirror Viewer Scientific Curio Antique

$107.72

Antique Brass Large Postal Letter / Small Parcel Scales with Weights on Oak Base

$14.3

Double-round-head Water Rod – Copper Dragon-seeking Ruler (Double Beads)

$26.93

-FLOATING DAIRY THERMOMETER IN ORIGINAL CARDBOARD TUBE, BRITISH

$99.95

Antique American Moistening Co. Boston MA, Standard Wet bulb /Dry Hydrometer

$53.87

Traditional Geometry Set in wooden presentation box, dated late 1800s.

$107.72

Very Rare Vintage AGL Ltd. #78 Glass Tube Analogue Micro & Milli Ammeter