Vacuum shade with hand and electric pump, vacuum gauge, bell and sound sensor

MACHINE TRANSLATION (not authorised yet)

Practical school vacuum experiment kit that demonstrates that sound waves do not propagate in a vacuum. The set includes a large, transparent lampshade with a bell inside (power supply 4-6V AC / DC, flat battery or power supply (included)), placed on a rubberized base with an integrated hand pump that allows for significant dilution of gases inside the lampshade and lowering the volume ringing. For better and faster effects of the vacuum, the set includes an electric pump with a vacuum gauge, as well as a sound meter to easily track changes in noise intensity in dB (A).

Kit contents:

• Vacuum diffuser placed on a rubberized base with an integrated hand pump
• Electric bell (power 4-6V AC / DC, flat battery or power adapter (included))
• Electric pump with a built-in vacuum gauge (capacity 51 l / min; Vacuum: 2Pa; built-in protection against overheating; integrated, specially profiled fan for better engine cooling; built-in sight glass allows you to check the level and quality of the oil; power supply included: 230V 50Hz;)
• Electric pump oil 330 ml (before using the electric pump for the first time, it must be filled with oil!)
• Digital sound level meter 30..130 dBA (Accuracy: +/- 1.5 dB. Resolution 0.1 dB. Frequency 31.5 Hz… 8.5 kHz. Autocalibration: 10 seconds. Electret microphone. Low battery indicator. LED backlight - turns on automatically in low light conditions. Powered by a 9V battery (included). Windshield included)