Melde's Apparatus Force Meter the distance (length) can be

the distance (length) can be directly measured remotely

is held at the mouth of the other chimney making the convection current dramatically visible

Made from natural wood

water glass

Luminous display respiratory system

Melde's Apparatus Force Meter the distance (length) can beMelde's Apparatus Premium Quality: Melde's Apparatus is made of high grade construction all the way through, excellent build quality and proven reliability across the range. Designed for use in professional laboratories but is an ideal choice for science classrooms and household use. If you need custom order with different sizes design, please contact us.