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Vintage 1960-80’s Healthcare PH-Gas Calculator Slide Rule Instrument Massachuse
Purpose: This clinical tool was used by healthcare and lab professionals (predominantly in the 1960s through the 1980s) to manually compute and analyze blood acid-base balance parameters, such as total carbon dioxide (CO₂) content, partial pressure of carbon dioxide (PCO₂), and bicarbonate concentration based on blood pH.
• Design & Layout: It is made of a lime-green and white rectangular plastic sleeve featuring multi-layered alignment windows, sliding inserts, and technical mathematical grids/nomograms printed across the face
