30 Minute White Marble Hourglass

      Product Features:

• It is a time tool consisting of glass that contains two parts.
• It is done through the upper part that contains an amount of sand that flows to the lower part.
• The time is calculated by estimating the descent of the last grain of sand, the representative We recalculate the time again published by turning the insulation upside down after the descent of the last grain of sand and repeatedly.