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Jennings CJ4000 Scale

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We've looked long and hard for a scale that we can recommend for our avid manual brewing friends. The scale needed to have a high weight capacity, fast response time and precision calculations, and the ability to disable the auto-off feature to ensure the scale would not shut off mid-brew. The Jennings CJ4000 is the first scale we have offered that meets all of these requirements. With a 4000 gram capacity, accuracy to .5 gram, and the ability to disable the auto-off feature, the Jennings scale is the perfect companion to manual brewing.


  • Reads in Grams, Ounces and Pounds
  • Weight displayed in .5 gram increments
  • 4000g Maximum Weight Capacity
  • Auto-Off feature can be disabled to allow for uninterrupted brewing.
  • Tare and Zero Function
  • Tactile Rubber Keypad
  • Cover that doubles as a Bowl with Pour-Spout
  • Large LCD Display
  • Round, Stainless-Steel Platform
  • Runs on Batteries or Included AC Adaptor
  • 3 AAA batteries included
  • Advanced Parts-Counting Feature
  • 20 Year Warranty

*Image is a representation. Actual product may vary based on model, size, and options selected.


Jennings Scale Company is known for their high quality and precision scales. They offer a wide selection of scales suitable for many environments. Prima Coffee specifically sought to carry Jennings for their precision and ability to disable the auto-off feature on their scales, making them perfect for manual coffee brewing.
Jennings CJ4000 Scale is rated 4.705882352941177 out of 5 by 17.
Rated 5 out of 5 by from Integrates whole brewing process Been using it two three times a day and finding that the scale works easily and without glitches. It turns on easily and sets back to zero before each of three measurements I make during brewing. My process is as follows: 1. Weigh 420g water directly into kettle and the heat to 190 degrees Fahrenheit. 2. Weigh 28.5g coffee beans into Scale lid pour into grinder and grind at setting between fine and medium and pour into cone with filter. 3. Weigh about 400g hot water while pouring over ground coffee in cone above 14 oz. drinking cup, pausing at about 80g for blooming. 4. Drink coffee.
Date published: 2015-01-25
Rated 5 out of 5 by from Best Scale For The Money For $40, this scale exceeds expectations. Specifically, I'm glad it does not have an auto-off function. That frees me up while I'm brewing to focus on brewing, not keeping the scale on. It is a little bigger than I like for a personal use scale, but the rest of the functionality makes it worthwhile. I also like that you can flip the casing over on top and brew on that. I don't know how many scales I've ruined by an accidental overflow, bump of a full mug or mis-placed water stream. This keeps it relatively idiot-proof. I do wish you could turn off the beep.
Date published: 2013-12-12
Rated 5 out of 5 by from Very quick! I noticed my old scale was kinda slow but I adjusted to it in my pour but I never realized how much of a difference that a scale with quick weight reading would make such a big difference in the way I pour. This scale is not much more money than you would probable spend on any other scale for coffee and it is definitely worth all the buzz I hear about it. And for those of you like me who don't keep batteries on hand, it has an wall plug adapter that you can switch to.
Date published: 2014-03-29
Rated 5 out of 5 by from Great scale at a great price! I bought this scale kind of on a whim for my new Chemex. I was going to spend a bit more time researching different scales, but when I read a write up from Prima about this being a great scale, especially for beginners, I figured I'd give it a shot. I'm so glad it did. It's a great product, easy to use, and very affordable. I would recommend for both beginners and experienced coffee makers.
Date published: 2014-01-10
Rated 5 out of 5 by from You NEED this scale!!! Let's face it, the ability to achieve the proper ratio of coffee-to-water is essential to brewing great coffee. I would place a gram scale right up next to a good grinder as the two essential pieces of gear needed to achieve coffee nirvana. My coffee tastes SOOOO much better now that I've started weighing for ratio. The difference is like night and day. It simplifies and brings consistency to the process of home brewing and helps to conserve my precious beans to boot. The fine folks at Prima asked me to do a review, which I NEVER do. I had a tiny issue with my order and they took care of me instantly, no questions asked. Impressive service and I will be a repeat customer! Awesome shop, Awesome scale!!!
Date published: 2015-02-16
Rated 5 out of 5 by from Great little scale, love the tare feature and the way the cover protects sc Bought this a couple of weeks ago to go with my areopress coffee maker that I got from Prima also, couldn't believe that 1 gram difference can make such a difference in taste, this helps to make a consistent great cup of coffee. Thanks Prima
Date published: 2016-03-06
Rated 5 out of 5 by from Accurate and easy to use First and foremost accuracy is of most importance when it comes to buying a scale, and this scale has it. It's accurate, has a clean aesthetic, and is large enough to fit a chemex 6 cup pour over brewer on. The only minor drawback I would say is the loud beep that happens when you press any of the buttons. However If you are working in a loud shop it isnt even that noticeable. Great scale!
Date published: 2015-02-11
Rated 4 out of 5 by from Mixed feelings I had been eyeing this well-reviewed, wallet-friendly scale for awhile (was trying to decide between it and one of the much more expensive scales available from Prima) and then unexpectedly received it as a gift. I have mixed feelings about it. It is large and bulky, not terribly attractive. But my issue is mostly with the accuracy. Unfortunately, I don't have another scale or any weights to test it but I can tell you that in my experience using it the readings seem to fluctuate. For example, I will sometimes go to weigh out my grounds, wait for the reading to settle, then wait a few more seconds just to make sure it registers, and then as I move onto other steps in the brewing process (not touching the scale) I will notice it either going up or down in weight. Also, if I brew on the scale and tare after my dripper is all set up, then pour my grounds in, the reading is different than when I weighed just the grounds (taring after I set the measuring cup on the scale, before I put the grounds in) And if I happen to accidentally bump it, it goes crazy and shows me crazy weights - which is inconvenient, because I have bumped it in the midst of weighing grounds and then had to pour the grounds out, and then back in again, more than once. The good: I like that you can use batteries or plug it in and that you can easily adjust the unit of measurement (grams, ounces, pounds, pcs function) Overall, I think that it is a decent scale (assuming the weights are accurate..) but I personally would prefer the extra functionality of the other scale I was contemplating, as well as the thoughtful design.
Date published: 2016-01-07
Rated 5 out of 5 by from Well made great warranty This is one solid product. Immediately compared it to previous scale and saw how off it was. Lights up when adding content. Has stay on feature which I use when brewing coffee so doesn't shut off in middle. 20 year warranty. I love when u find a good product.
Date published: 2015-01-23
Rated 5 out of 5 by from Great scale! I bought this because I needed a food scale. The ones I looked at were only battery powered with no option of ac and did not weigh in .5 gram increments. I've only had it for a week but it is very easy to use. Even my parents are able to use it.
Date published: 2015-02-05
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Has anyone had issued when brewing larger batches? Mine will read accurately up to around 500g then starts to plummet. I tare and weight my decanter and it reads at around 1000g then begins to plummet. This only happens with hot objects.

Asked by: asks
I've weighed all sorts of objects from my daily coffee to postage to my concealed carry gun and have had no problems. I don't weigh the water I use a settled volume ( my coffee cup + ) that works well for me. The scale is not exposed to heat.
Answered by: Skip
Date published: 2016-06-14

Will leaving something on the scale while it's off affect it accuracy overtime? Is it ok to leave my Hario Range Server sitting on the scale 24/7? I like the protective lid, but it is kind of bulky and ugly.

Asked by: Robert
You won't hurt this scale by leaving objects on the plate.
Answered by: Rfelb
Date published: 2015-03-02

Does this scale come with instructions to disable the "auto-off" mode? If not is simple to figure out? I'm looking to upgrade from the cheap kitchen scale that keeps turning off during my brewing...

Asked by: WhatWouldJesusBrew
Yes. Directions for disabling the auto-off feature are included in the manual.
Answered by: Rfelb
Date published: 2015-01-09

so i didn't realize that my scale was calibrated at the factory and tried to calibrate it myself. how can i fix it?

Asked by: Skelton
Please email us at for help.
Answered by: Rfelb
Date published: 2014-12-30

What is smallest amount it measures accurately

Asked by: LesS
Hey, Les. This scale has a .5g accuracy. If you're measuring very small amounts 1g-5g, this scale may not have ideal accuracy for you, and we'd recommend something like the Hario Drip scale which has 2x the accuracy. It is, however, great for brewing coffee when .5g accuracy doesn't have a noticable impact on a 20g-30g dose.
Answered by: Rfelb
Date published: 2014-03-13

How crucial is calibrating with 4000g weight? Is scale accurate before calibration?

Asked by: techie
Hello. Your scale was calibrated in the factory, and should have arrived to you in perfect working order. these scales don't typically develop issues, but you'll know if your scale starts giving wonky measurements down the road.
Answered by: Rfelb
Date published: 2014-02-19

What is the diameter of the weighing surface?

Asked by: nosaj97
Hello. The diameter of the weighing surface is 5.4".
Answered by: Rfelb
Date published: 2014-01-31
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