The 6 Best Hand Vacuum Pumps

6. GSC International 4-2061 Made by a family-owned company that designs science education products, the GSC International 4-2061 (appx. $23) gives students a hands-on experience while learning principles of physics. It weighs a mere 5 ounces, and provides readings in two units of measurement. Easy-release valve Can make a squeaking sound Not suitable for heavy-duty …

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