220V Spectrum Tube Power Supply with Safety Door, US Standard Subcategory_Meters and Testers Autoclavable polypropylene test tube stand

Autoclavable polypropylene test tube stand holding six 25-mm tubes with six drying pins on the back

Discontinued 250mm Wimshurst machine with transparent counter-rotating plates

and balance arms during physics force and pressure experiments

this set turns standing-wave acoustics into a hands-on length measurement

220V Spectrum Tube Power Supply with Safety Door, US Standard Subcategory_Meters and Testers Autoclavable polypropylene test tube standA safety door interlock prevents contact with energized electrodes by cutting power whenever the door opens, providing 220V excitation for atomic emission spectroscopy tubes.