Works well for taking samples from carboys during fermentation. One-handed operation allows one hand to be used to remove and replace the carboy stopper for access to draw a sample quickly and without setting the stopper down, thus reducing the risk of introducing wild microbes into the batch during the process.It gets the job done, but i've had higher quality pumps that looked very similar in the past. For the price and only occasional use, its adequate.Bought to precisely measure dyes for repeatable results when using primary colors to mix secondary and tertiary colors.Típico pipeteador, correcto y barato.Lo uso prácticamente a diario y nunca me ha dado ningún problema.Estoy contenta con el.??