Syringe, peristaltic, vacuum: which lab pump do you need?
Four kinds of lab pump, four completely different jobs. Buying the wrong one is the most common mistake we see in used lab equipment.
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buying-guide
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.
What kills a surplus lot before you even bid
Most surplus lots that look like bargains are traps. Here are the failure modes we have learned to spot from the listing photos alone.