Magnetic Stirrer Hot Plate w/Stir Bar,100-2000rpm Magnetic Hotplate Stirrer, 180W Heating Power Hot Plate Stirrer, Max 520℉ Hot Plate with Magnetic Stirrer

This is the best and user friendly magnetic stirrer hot plate ever existed. It is less heavy and easy to use for different projects. The product comes with a portable support stand that you can use to perform titration and droplet mixing of two different chemical solutions. Absolutely, useful for micro/nanoencapsulation application. I have used it to prepare enzyme micro-encapsulation beads for a mini project, and the result was successful. I will definitely recommend anyone to buy this product as it is cheaper and value for money.

Received and tested. All works as described. Heat pad did not make it to 500 degrees but did go 488 which is no big deal to me. With a non-viscous liquid such as water the spinner does not go slow enough to prevent cavitation. I can turn it down all the way and a fraction more it cuts off. But at the lowest point prior to cut off it spins fast enough to pull in an occasional micro bubble. I don't think this would happen once I added a foreign material but would be nice if it had a little mor control at low speed.

Well constructed, clean, no BS, cheap, sturdy little unit. And the magnetic stir feature is well tuned and works well, which is something I was worried about. My only complaint is the heat, it's not very powerful at all. So much so that I doubt it's hitting the claimed wattage output. I've had 300-200mL of tap water in a 500mL Erlenmeyer flask on this for about the last hour or two with very light stirring and full heat and I'm only barely getting to boiling. It's certainly not a powerful, rolling, foaming, kind of boil though. Outlet can run a 1500w space heater without problems, so it's gotta be this things heat element. So, it's maybe good for extremely small volumes, low power organic synth, or getting organic solvents boiling. I could see this being AWESOME for reactions that need a constant, low heat for ages. But it's not great for anything more power demanding. You're certainly not going to dehydrate sulfuric acid or distill mercury with this. I may return, then again, I may try and remove some length of the heater wire to up power. I could also set it aside for the above mentioned reasons, since it would be the perfect tool for that purpose.

I really like the Anzeser hotplate stirrer. After reading the reviews, I found a work around for a couple problems people often mentioned. I plugged it into a “Kill A Watt” P4400 meter that I’ve had for years, and set it to measure watts. This allowed me to quantify the amount of power the hotplate was getting. Using an inexpensive thermocouple thermometer, I measured the hotplate surface temperature at 10 watt intervals from 10 watts to 180. This allowed me to easily replicate hotplate temperatures, and avoid overheating the little Anzeser. Also, some of the reviews complained about the magnetic stirrer losing its grip on the stir bar. I found the stirrer worked quite well, as long as the volume of liquid is one liter or less, not a higher viscosity than water, and contained in a lab beaker, which typically has a fairly thin bottom. Anything with a thicker bottom will diminish the magnetic attraction, possibly causing spinouts. There’s something else you should know about magnets. The strongest type is neodymium, but it turns out they are not very heat tolerant, unless Dysprosium (Dy) or terbium (Tb) is added during the manufacturing process. If you heat a magnet past its working temperature limit, it starts to permanently lose some of its magnetic strength. I contacted Sakerz, the seller, to find out more about the stirrer magnets. They responded very quickly, telling me that the stirrer drive magnets are neodymium, treated with Dysprosium (Dy) or terbium (Tb), with a maximum working temperature of 180 C, which is pretty impressive at this price point. My advice would be to not heat the hotplate past the max temperature of 520 degrees F (271 C) or for more than 4 hours at high heat, as mentioned on the web site, to prevent heat damage to the stirrer drive magnets. Just out of curiosity, I set up a test platform with a computer cooling fan I pulled out of an old computer, to blow air into the cooling slots on the bottom of the hotplate, and a thermocouple thermometer inserted next to the drive magnets. The fan I used is a two wire 12 volt brushless DC fan, 80 mm square, rated at 32 cfm, powered by a plug in AC adapter I had in my electronics parts box. After 30 minutes at a plate temperature of 271 C, the magnet temperature was only 34 C, and it seemed to stabilize at that temperature. The airflow through the case also served to cool the stirrer motor and control circuits. I haven’t tried a run of several hours yet, but I’m confident that with the fan running, the magnets would stay at a safe temperature for even longer than that. I can’t comment on the long term durability since I’ve only had it a short time, but if I don’t push it past its limits, I think it will hold up well. So I would call it a good value at $45, and Sakerz, the seller, also provided good customer service, by answering my questions quickly.

Stirring broke during the first use. Works well for less than 1 hour. Noticed it was stirring slower after 10 minutes and eventually even the slower stirring setting was slowing down. Temperature control is non-existent for a fractional distillation it was impossible to control the rate liquid was coming over. Plate is very small and would be unstable for most beakers and flasks larger than 1L. I haven't tested maximum heat (probably will break it too like max stirring did). It comes with a thermometer holder with a plastic holder so flimsy it could easily snap by being bumped. Released annoying and probably toxic burning plastic smell while stirring.

It arrived, packaged well. I tested it with a 500 ml beaker full of cold water, with the stirring on about halfway, and slowly increased the temperature over time. The heating and stirring work well. The attaching arm could be a bit better, but for the price and getting the job done, it's a great item.

I’ve been using this stir plate for years in mostly mycology but also good ole cannabis!

I only used it a few times so far but it's a lil hard to calibrate hot it the plate is getting and when I turn the stirrer on more then half way the little magnetic pill flips out of place and gets thrown around my beaker . Not pleasant