39 Dyne pen's video
NBCHAOVIDEO384 plays · · 2020-04-16
Fengzhiyue 39 Dyne pen is a blue Dyne pen, suitable for surface tension detection of thin films, metals, etc. The dyne water of 39 Dyne pen is composed of 8.20% ethylene glycol ether and 11.8% formamide.
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