Are IC rail tubes sufficient protection for ESD-safe storage?
You cannot measure whether something is able to leak away ESD charge with a multimeter. The resistances required for something to be static dissipative are just too high for a normal meter. You need large electrodes and high test voltages.
Also &quot;ESD-safe&quot; has varying degrees:
Dissipative: slowly leaks away charge which eliminates charge build-up and suppresses discharges through the material itself
Conductive: quickly leaks away charge which eliminates charge build-up but does not suppress ESD discharges through the material
Low-charge generation: Reduces charge build-up. Does NOT leak away charge. Does NOT suppress ESD discharges.
Shielding/Metallic Foil Bags: Technically falls under conductive but is structured such that when the package is sealed actually does protect the inner contents from ESD discharges.
If it's cheap packaging that is not metallic and not black it is probably low-charge generation at best. I assume all cheap packaging that is translucent, transparent, blue, and/or pink but non-metallic as low-charge generation.