CAT Scientific MCS 66 Stirring Hotplate Test

CAT Scientific hot plate at 46C-1-1

For ya’ll brothers and sisters doing serious extraction and alchemy requiring a stirring hotplate, heads up, cause we’ve been testing a CAT MCS 66 that bears your attention and investigation.

We use a stirring hot plate for various things and have gotten by using our aging Thermolyne, but have never been able to maintain accurate even heating in the low ranges between 18C/85F and 46C/115F, so it requires constant monitoring.

We’ve tested the CAT MCS 66 in a variety of different applications, both in the lower ranges, as well as above 100C/212F, and it adds new meaning to the word steady.

For instance, it kept a solution at 46.C for two days without ever flickering to 45.9 or 46.1C.

Wanna talk about stirring ability?   How about spinning a stir bar in cold vegetable glycerin through a stainless steel bain marie container?  Hee, hee, hee…………..

Check out this vortex with water at less than half throttle……..

 CAT Vortex-1-1

Those of ya’ll who like to play with buttons, will love the digital LCD display, and array of membrane button choices.  Besides individual on/off buttons for overall power, there are individual controls for the plate power and the stirring motor.  There are two up down buttons, and selection buttons for setting plate temperature, stirring motor rpm, container volume, how fast a ramp up, timer, upper limits, and monitoring the temperature of an emersion thermocouple that plugs in to the base.

The thermocouple monitors the actual temperature of your solution, separate from monitoring set point and hot plate surface temperature.  With water, at 36C set point, the hot plate held steady at precisely 36C, and the 500 ml of water came up to and stabilized at a rock steady 28.5C.

CAT S Hotplate-1-1

CAT stirring hot plate set point-1-1CAT stirring hot plate probe-1-1

The probe is available with a couple of holders, one which was damn clever, but light weight enough that ole fumble paws there found it easy to inadvertently destroy, as well as the heavy duty one that they replaced it with the second time around.  I really like the new clamp, in that it is not only too heavy duty for me to wipe out, but it opens wide enough to hold test tubes.  Hee, hee, hee…………………..

Verifying the reported temperatures with our infra red laser thermometers uniformly resulted in the same temperature or within 0.1 of the same reading, so we are pretty pleased with the accuracy as well.

Thanks to CAT Scientific at for the loan of this piece of equipment for trials and a salute for a good job that impressed us!

11 responses to this post.

  1. Posted by Steve on April 13, 2016 at 3:43 AM

    We discovered a process with the CAT MCS78 Hotplate Stirrer for removing residual Ethanol from BHO, C02 oil ,after winterization……


  2. Posted by psedona on October 13, 2014 at 3:30 PM

    In the market for an “affordable” but similar hotplate/ stirrer. Any one recommend anything? Corning, benchmark scientific, thomas, etc? For home use.. Any help will greatly help! Thanks.


  3. Posted by daryl on February 5, 2014 at 9:02 AM

    nice rig… hey mainah live in washington county, anywhere near?


  4. Posted by William on January 19, 2014 at 8:32 PM

    I was going to ask a very similar question to Mainah in the last post: When doing QWET and QWISO extractions, and given the choice, would you now use the stirring hotplate for the finish and decarboxylation or would you continue to use the fondue pot? Thanks!


  5. Posted by Mike-420 on January 16, 2014 at 6:06 PM



  6. Posted by Matt on January 16, 2014 at 12:35 PM

    Very cool! Thanks


  7. Posted by Mainah on January 14, 2014 at 3:21 AM

    So, will you be using this new toy for extractions, decarboxylation, etc?


  8. Posted by Nir on January 14, 2014 at 2:30 AM

    Well… I am using a digital HotPlate/stirrer to get 100% THCA to THC and 0.6% THC to CBN. i put a stainless steel cup on the hot plate (NOT GALSS), temp of plate is 140 c, the stirrer is on 300-400 spins/second. i DO NOT use the external probe! it can heat up the plate to very high temps in the beginning (at least in my plate which is a different brand the yours… and cheaper) . i use an external digital thermometer just to keep the temp of the oil known… but it is not scenery if you put the plate on 140 c . the decarboxilation will be very very violent and when it ends the bubbles STOP Immediately.. it is very easy and cant be missed.


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