A&D EJ-3000: Versatile Scale for Cerakote, Epoxy, and More

I’ve been looking for the perfect high-quality scale for things like mixing Cerakote and mixing epoxy for bedding jobs. I’ve found it in the A&D EJ-3000 from Cambridge Environmental


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About the A&D EJ-3000

The EJ-3000 isn’t the first scale I’ve tested from Cambridge Environmental. I’ve tested the A&D FX120i 0.02 balance, which is actually a precision laboratory balance. It has 0.02 grain resolution and works with automated powder dispensers. I also have the EJ-54D2 which is my most sensitive scale, capable of measuring 0.003 grains. 

While these precision scales are wonderful, they have limited capacity. This is fine for measuring smokeless powder, but when it comes to measuring Cerakote or epoxy, I needed something with a greater capacity. 

The EJ-3000 has a 3,100 gram capacity and a 0.01 gram resolution. 

From Cambridge Environmental

Affordable, light and compact balance. A&D is GLP / GMP / GCP / ISO compliant and ideal for pharmacy, educational and industrial use. Features up to 70 hours of battery use and comes with built in features to facilitate advanced weighing operations. 


    • Applications
      • Counting with Automatic Counting Accuracy Improvement (ACAI)
      • Percent
      • Display Hold
      • Accumulation M+
      • Gravity Acceleration Correction
    • Weighing Units
      • g, oz, lb, ozt, ct, mom, dwt, grain, N, pcs
    • Connectivity
      • RS-232C interface
      • Quick USB interface (optional)
      • LAN – Ethernet interface with WinCT-Plus software (optional) 


    • Capacity: 3100g
    • Readability: 0.1g
    • Repeatability: 0.1g
    • Linearity: ±0.2g
    • Calibration: External (3000g)
    • Stabilization Time: ~5s
    • Sensitivity drift: ±20 ppm / °C (10°C-30°C / 50°F-86°F)
    • No. of samples: 5, 10, 25, 50 or 100 pieces
    • Min. unit weight: 0.1 g
    • Min. % display: 0.1%
    • Min. 100% weigh: 10 g
    • Display: 7 segment LCD display with backlight (Character  height 16 mm)
    • Display update: 10 times per second
    • Weighing Pan Dimensions: 127 x 140mm
    • Product Dimensions (mm/inches): 190 x 211 x 82mm / 7.48 x 8.31 x 3.3in
    • Operating temp: -10°C-30°C, less than 85% R.H. (non-condensing)
    • Power Supply: AC adapter (included) or 4 x “AA” size dry-cell batteries (Approximately 70 hours backlight off, alkaline batteries)
    • Compliance: GLP / GMP / GCP / ISO
    • Calibration weight (factory setting): 3000 g
    • Warranty: 5 Years

What’s in the Box

The A&D EJ-3000 I’ve been calling a scale is technically a compact balance. In addition to the balance, it comes with the pan, an owner’s manual and power supply. 

Calibration and Set-Up

Calibration is incredibly simple. Place the pan on the scale load cell and connect the power-supply. (I make a habit of labeling my power supplies so I know what they go to.) Turn the scale on and make sure it’s level. There is a small bubble level to the left of the display that makes this even easier. Let the balance warm up for about 30 minutes before you start the calibration procedure. 

The entire process is specified in the owner’s manual. Select the weight you plan to use. I opted for a 50 gram weight. After selecting the calibration weight, it does a zero calibration with nothing on the scale, then it will continue with whatever weight you selected, then it will show “end.” 

This balance is impressively fast. If you watch the stable indicator, it responds quickly. This is key when adding catalyst. 


I’m working with two colors and putting together a test panel (stainless steel tray) to not only review the color but perform some laser engraving settings tests. I’m using H-139 steel gray on one side. I zeroed the graduated cylinder (215.9 grams),  measured out 66.3 grams, and with the help of the mix calculator from Cerakote, determined I needed 2.81 grams of catalyst. Rather than doing math, I zeroed the scale with the Cerakote and graduated cylinder and poured catalyst until I reached between 2.8 to 3 grams. I ended up with 3.1 grams. 

I grabbed a glove to conduct the mixing and poured it into the gun to start painting! 



The EJ-3000 did a great job with both colors of Cerakote I measured and mixed. The scale was very quick to update and stabilize. It was also sensitive to each drop going in.

I suspect this will also be perfect for mixing epoxy and weighing small gun parts. 

Whatever your weighing needs, Cambridge Environmental has something that will work for you. 

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Gavin Gear 

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