±2.5mA DC Interchangeable Dial for Demonstration Meter Glass Sets & Apparatus_Organic Chemistry Sets using wide-pad threaded metal screws

using wide-pad threaded metal screws for secure fastening

Binaural stethoscope with PVC tubing provides clear heart and lung sound detection for medical and nursing education

supporting reproductive cell biology teaching

this magnified animal cell model reveals organelle ultrastructure and cellular organization for advanced biology instruction

Life-size right lung separates into two parts exposing bronchial tree and alveolar structure

±2.5mA DC Interchangeable Dial for Demonstration Meter Glass Sets & Apparatus_Organic Chemistry Sets using wide-pad threaded metal screwsPlus or minus 2. 5mA DC interchangeable scale on a 315x115mm laminated panel with integrated shunt, sized to drop into the demonstration meter and reconfigure it as a center zero ammeter.