日韩在线欧美精品第二页观看_www在线免费观看视频_国产69精品剧情视频_免费成人直播_日本亚洲免费在线电影_月亮影视大全_五月激激激综合网色播胖胖_国产成人精品久久56_总裁与秘书啪啪日常H_被翁持续侵犯的中文字幕

Based on the design of Prof. Dr. Franz Ruttner, our contemporary model is a handy and versatile instrument to take water samples from any desired depth. Due to the simple and practical design of the transparent sampling tube and the closing mechanism the sampler is renown for its reliability for many years. The Standard Water Sampler (whilst open) is lowered into the water by rope. Upon reaching the desired depth, the messenger activated closing mechanism is released and closes the lids of the sampling tube. A built-in thermometer, ranging from -2° to +30°C, indicates the temperature of the sample. To retrieve the water sample for analyses only the discharge cock at the lower lid has to be opened.