NIM-20. Hours sand 20 minute.Are available
Product Code: ЧПм-20.
hourglass allow you to countdown to 2 minutes. They are used in laboratories, treatment rooms of medical facilities.
Watches are two communicating glass bulb, connected by a thin isthmus. Inside the flask is sand, which in a vertical arrangement hours over time falls out of the flask from one to another.
Glass part is made of chemical glass. Stands are made of plastic.
Hours are convenient in that they can quickly turn the gloves. In contrast, chronometers and watches do not require adjustment, not afraid of exposure to aggressive media. Hourglass can be washed, they are durable and reliable. Hourglass disadvantage is their fragility and non-repairable.