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These 6 spring balances can measure forces in two separate directions using a spring for compression. With both grams and Newtons available for measurement in experiments.Pull/Push Spring Balance 10N - SPP1 (Brown)Pull/Push Spring Balance 20N - SPP2 (Red)Pull/Push Spring Balance 50N - SPP5 (Yellow)
Used to explain weight vs mass. Calibration was spot on
Good product for price.