Slendor Magnetic Stirrer 5000ml Hotplate Mixer 2000 RPM Hot Plate Max 300℃/572℉ Lab Heating Plate Stirrers with LED Digital Display, Stir Bar, Temp Sensor and Support Stand

Bought 4 units. All are functioning well. Temperatures were checked against a NIST referenced RTD and was within tolerance. The base is a little bulkier than I would like, but otherwise a well designed device.

My brother's inner scientist loved it! It can stay both cool and warm enough to stir coffee or tea. Functional enough to make small batch candy, too.

This unit has a external temperature probe, but seemingly no close-loop temperature regulation. I have, working with 50 mL fluid quantities, configured the temperature set-point, attached the probe and watched the hotplate plow past the target. I think the issue is more than specific heat 'inertia' as the heater did not cut out under a severe temperature overshoot.

Does everything a hot plate should do, but why does the control knob change apply an acceleration to the increments when the knob moves faster? Every time I turn a knob I drastically overshoot the value I'm going for due to this weird acceleration. I have to dial in the rpm and temperature values extremely slowly so the acceleration doesn't kick in and send the value flying. If I want to increment the values faster I just turn the knob faster, that's how knobs work. No need for digital acceleration on top of that.

First time I tried to heat up water with the thing it developed massive lumps on the heated plate. It is essentially useless now, as nothing will sit flat on the plate, hence very poor heat transfer. If you buy this, PUT IT THROUGH ITS PACES BEFORE THE RETURN WINDOW CLOSES, instead of 5 days after like me.

The stir function works reliably however, the software for it could be improved at very low RPM. The stirrer speeds up and slows down. It stabilizes at about 350 RPM and above.If I need another stirrer, I'll be buying this.

I liked it while I had it (bought it in march this year), but 300C or even 280C will kill this thing if you're using it heavily, like running it at 280 for 3 days. It does give you an error warning, but soon the display and speaker died. I'm not sure why advertise it can hit 300C if you can't actively use that setting. I tried to examine the pcb's inside hoping I could fix it but I'm only a chemist and not an electrical engineer. If there's replacement pcb's for sale by the manufacture I might give it 4 stars for repair-ability. Being able to easily fix your work horse should be the gold standard of hot plates under heavy use.It still surprises me this hot plate took 300ml-500ml of boiling Caro's acid foam over and survived, yet 3 days at 280 is what seals it fate.

See attached photos, I’ve been able to get it up to 538w, heats up quick and is easy to use. Spend the extra money from a generic sh-3 or sh-4 and and get this, definitely don’t get a generic sh-2. I have them all. This one has a nice lcd screen which shows you digitally the exact rpm the magnetic stir bar is spinning, exact temps according to the probe and hot plate, and many other little notifications. With generic models, you’ll see in reviews that the power adjustment knob isn’t very intuitive so it’s either on full blast hot or not heating even though you’re at medium settings, this one keeps it plain to see on the lcd screen. Other modes will need you to invest in a “Kill A Watt” meter plugged in to the outlet in order for you to understand how many watts of heat you’re adding. You can see I have one setup in my pics and it is using a fair deal of power to heat my experiment as intended.