Hospital Equipment Mfg. Co. Manufactures Push Pull Spring Balances. Hospital Equipment Mfg. Co. Is an ISO 9001:2000 certified company. Push Pull Spring Balances have a dual usage in which they weigh suspended objects as well as measure the force of pushing or pulling an object using the extended rod. Push Pull Spring Balances are calibrated in grams and Newton and color coded for easy identification. These push pull spring balances are available in different capacities and color codes.