VWR Desi-Vac Containers is a reliable and dependable addition to the VWR Laboratory Apparatus family of products. Combining top-notch and uncompromising quality with an affordable price, the VWR Desi-Vac Containers 3163/ 36934-144 can fulfill your laboratory needs while still offering a great value for the money. The VWR Desi-Vac Containers are plastic containers with a vacuum pump for drying, preserving, and shipping samples. Containers are ideal for storing chemicals, powders, tissues, plant sections, electronics, and weighing samples. Vacuum pump built into the top removes air with manual strokes and the rubber O-ring-sealed cover maintains vacuum. Containers achieve a vacuum of better than 508cm (200") of water or 38cm (15") of mercury. A release button on top allows air into the container to remove the lid. A vacuum-indicating button confirms interior vacuum and the built-in dial hygrometer displays 0 to 100% relative humidity with a resolution of 2%.