Fill 'O' Fun is Perfect for exploring basic measurement concepts. Measure, explore volume and compare solids and liquids with this sturdy balance. Using visual teaching aids like platform scales and a pan balance can help illustrate measurement concepts needed to solve math problems. Teach weight, measurement and grams with this strong, durable, plastic balance. Features two detachable buckets for easy clean up.This Fill 'O' Fun is used for accurate measurement there is a sliding compensator for zero adjustments.