vintage meter devices Knife Switch, single pole - single

Eisco Labs Knife Switch, Single pole - double throw

Eisco Labs Knife Switch, double pole - double throw

Insect Pooter - Device to Safely Collect & Observe Bugs - Eisco Labs

Hydrometer - Specific Gravity, Heavy Liquids, 1.000-1.500 x 0.010 - Eisco Labs

Eisco Labs Knife Switch, Single pole - single throw

Crook's Radiometer, 2.75" (70mm) Diameter, Mounted on Plastic Base - Eisco Labs

Eisco Labs Premium Double Wall Calorimeter, 150mL Capacity