Replacement O-rings for five-position NMR tube cleaner system

Breathe-Easy^® sealing membrane

Breathe-Easy^®封膜

DuraSeal^TM laboratory stretch film

Microcapillary tube Drummond Microcaps^®

Drummond Microcaps微量毛细管^®

Ace auto-zero McLeod vacuum gauges

Ace four-neck round-bottom flask

Ace photochemical reactor UV lamp

Ace 光化学反应器紫外灯

Ace round-bottom flask with threaded side-arm

Aldrich^® can/drum adapters

Aldrich^® glass pH electrode

Aldrich^® non-corrosive lecture-bottle gas regulator