What an HPLC actually does, and why labs have so many
HPLC is how a lab finds out what is in a liquid and how much. It is the workhorse of analytical chemistry, which is why used modules are everywhere.
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hplc
The pump the seller said was broken
A lot was discounted because a pump "does not stay powered on." We could not reproduce the fault. Here is why that happens more often than you think.
How to buy a used HPLC module without getting burned
Agilent 1100 and 1200 modules are the most available used lab instruments on earth. Here is what actually determines whether one is worth buying.