Turbine-Driven Magnetic Stir Plate / Stirrer (Non-electric, GFS Chemicals)

Description

Non-electric Turbine-driven Magnetic Stirrer (GFS Chemicals).
These are modestly used but still highly functional stir plates that are driven by air or water pressure.
These are used for a few scientific applications that prevent the use of standard electric stir plates:
1. When electricity or spark hazards are unacceptable, such as when working with flammable or explosive chemicals
2. When one needs to submerge a stir plate, such as within a hot water bath
3. When one needs to stir solutions out in the field, but has no access to electricity.
These are hardy analog magnetic stirrers with intact hose barbs for connecting a source of gas or water pressure. I have independently verified the functionality of each unit using air pressure, and they should work well for your desired process.
They appear to be well-sealed and not overly abused. They have some scratches/discoloration from age and use, and some minor dents on a few of the gripping nubs. These cosmetic defects don't affect the function however. I have cleaned them gently, and have re-lubricated the internal brass components.
If for some odd reason your stirrer isn't functional or arrives to you broken, just mail it back for a full refund. I will pack them securely with ample foam cushioning for their travel, but they're pretty resilient.
Note:
- Some of these have clearly been used with water before, and there appears to be some minor spots of oxidation around the central bolt (see last picture). They are sealed though, so it's weird. It might could be a leftover stain from an iron containing solution in the past, but I chose not to try to clean it with anything too harsh or acidic.They all seem to work just fine however, and should still perform their function similarly to the others.
** If you would prefer stir plates that likely have been used with only air (5 available), or would be fine with these water-used ones if you could get a better deal, just shoot me a message at [email protected]. But like I said, they should work just fine regardless.
-Another common use for these devices is to connect them in-line and stir many solutions at a similar rate. Since they are of different ages and wear, I'm not sure if they will all spin at exactly the same rate if you try this. They'll probably do just fine though. You could get around this if needed with some needle valves or two-way stopcocks; fine-tune inlet pressure for each stir plate individually.