另外，我有个问题：这是一个什么仪器?
NOTE3 The use of a drop detector/counter is recommended to ascertain whether there are any double drops or whether drops are missing.
还有一句话不太理解：
cl 7.5 NOTE1
In order to avoid the problem of cleaning the specimen support table, it is recommended that a disposable glass microscope slide be placed on the specimen support table immediately under the test specimen.
这个disposable glass microscope slide 是什么？怎么起保护作用。