Interest-inspired: learning while playing can inspire children to have a strong interest in physicsDeepen understanding:thinking by hand can make children have a deeper understanding of knowledgeStudent digital dynamometer, electronic dynamometerThe range is 2N or 200g, the maximum range is 3N or 300g, and the buzzer will alarm when the maximum range is exceeded. Resolution: 0.001N or 0.1g. Error ≤ 2%, sampling rate: 80 times / sec Power: 3 7 AAA batteries. Digital size: ≥1.6cm×3.8cm