คุณลักษณะ

• 3 year old and weight
• 4 year old metal, water, air and temperature weight comparison block C type acrylic block fits perfectly.
• Since it comes with a lid, you can use it not only to compare the mass of metal blocks but also to compare the mass of liquids and powders, which is very convenient.
• Also, you can easily check that the volume increases when you fill Brockin with water and freeze it.