There are 12 unused chemical watch glass pieces in this box. Each measure 16.5cm across.
A watch glass is a circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance, and as a cover for a beaker. When used to cover beakers, the purpose is generally to prevent dust or other particles from entering the beaker; the watch glass does not completely seal the beaker, so gas exchanges still occur. When used as an evaporation surface, a watch glass allows closer observation of precipitates or crystallization. It can be placed on a surface of contrasting colors to improve the visibility overall. Watch glasses are also sometimes used to cover a glass of whisky, to concentrate the aromas in the glass, and to prevent spills when the whisky is swirled.[1] Watch glasses are named so because they are similar to the glass used for the front of old-fashioned pocket watches. These large watch glasses are occasionally known as clock glasses.
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Discount Policy: If you intend to purchase 2 items, whether the same item or different, we will accept an offer of 10% less than the list price, on both. Three items 15% discount. Four or more items 20% discount. All offers less than 80% of listed price are automatically rejected. Shipping costs are more difficult to adjust for a discount, so simply pay the listed shipping charges and after we combine your order and determine actual shipping cost we will issue a refund to cover the excess paid. Simply contact us to tell us how many items you intend to order and make the related offers as per this writing and your offers will be accepted providing all orders are made within 8 hours of the first one.
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