The glass on them is transparent and the panel is very easy to read. However, plastic pressure roller shutters break after one or two uses. At this point, you could also buy 50 cheap plastic syringes for the same price or less. The plunger is plastic and the seal is rubber, and they're strong enough for thicker liquids like vegetable glycerine. In truth, you don't. Don't waste your money on these unless what you're using them for is rubber and glass non-reactive. If you really need glass, buy it with metal fins and a glass bulb.
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