We know you have a choice when you buy scales online. Just know that when you buy digital scales from Old Will, it's always a "Worry Free Deal".
Home > Jewelry Scales, Diamond Scales, Gold Scales

Jennings Mack 20

PN: JS-MACK-20-P78
MFR PN: SCMACK20
In Stock
Old Will's Price: $64.90
Quantity

Jennings / JScale Mack 20 Digital Precision Scale

Innovative dual display design.
20 gram capacity x 0.002 gram resolution

Overview of the Mack20 showing the hinged cover in the closed position, backlit display, and operation keys
"In A Nutshell"
Power AC adapter (not included)
4 AA (included)
Display Blue, Backlit LCD
Tare Feature Yes
Calibration Feature Yes
RS232 Output No
Weighing Hook No
Platform Size 1.5" diameter
Scale Size 7.0" x 6.5" x 2.5"
Weighing Modes 6
Included Accessories
VibraKill Pad expansion bowl calibration weight Four AA batteriesr
  • 7.7" x 7.0" VibraKill® Pad

  • Expansion Tray

  • 20 Gram Calibration Weight

  • Four AA Batteries

Weighing Modes
Mode: Capacity: Resolution:
Grams 20.000 g 0.002 g
Grains 308.60 gn 0.02 gn
Troy Ounces 0.6430 ozt 0.0001 ozt
Ounces 0.7050 oz 0.0001 oz
Pennyweights 12.860 dwt 0.002 dwt
Carats 100.00 ct 0.01 ct
Ticals 1.7100 t 0.0002 t
Milligrams 20,000 mg 2 mg
Product Details
  • Two Weight Displays?

    That's right. Jennings designed this jewelry scale with two, bright blue, LCD weight displays...one on the front, and one on the back. So whether you load the scale from the front or the back, you won't have a problem seeing your weights.

  • Auto-Off Feature

    If ya have ever had the batteries in something run out because you forgot to turn it off, you'll realize what a blessing this feature is. The Mack-20 will automatically turn off after a few moments of inactivity, saving battery power and money.

  • Bright Backlit Display

    This digital scale has a fancy, blue, backlit display to help ya see your weight readings, even in dim lighting.

  • Hinged Protective Windscreen

    When you're weighing with high precision scales like this one, even the tiniest breeze can interfere with weight readings. This Jennings scale comes with an attached windscreen to keep out those pesky drafts. The protective cover is hinged, just press the button on the side to release it and lift it out of the way.

  • It Remembers The Last Unit Ya Used

    If your application needs weights in the same unit of measurement, (like ounces for instance), it can be a real pain if your scale always turns on ready to weigh in grams. It's a good thing the Mack turns on displaying the unit of measurement you were using when ya turned it off.

  • It Has WeighMeter™ Technology!

    If ya put too much weight, (more than the capacity of the scale) on any scale it can cause permanent damage. Unfortunately, most scales warn ya of an overload after it's too late. Luckily this digital scale comes with WeighMeter Technolgy to tell ya when you're coming close to the maximum capacity. This will save ya from overloading your scale and damaging it beyond repair.

  • Easy Calibration

    To make sure ya keep getting the best weight readings from your scale, it helps to calibrate it from time to time. This jewelry scale has instructions to make calibrating your scale easy. The Mack even comes with the 20 gram calibration weight ya need to use.

  • Tare Feature

    The tare button on the front of this digital scale can be pressed to "zero out" the weight on the scale. You can then add more weight, and the display will only show the weight of the items you're adding. This sure is useful when ya want to use the included expansion tray to weigh your things, or if ya want to get separate weights of multiple items.

  • Liquid Level Indicator

    This very handy feature helps you quickly and easily get your scale nice and level. A level scale is important for getting the most accurate weight readings.

  • Four Useful Accessories

    The Mack 20 comes with great accessories. Use the VibraKill® Pad under the Mack to keep vibrations from messing up your weight readings, and the calibration weight to keep it nice and accurate. If you're looking to use the Mack as a diamond scale or carat scale, the little expansion bowl is perfect for weighing those teeny tiny jewelry pieces. You'll even get a set off batteries so ya can start weighing as soon as ya get it.

  • Kill Those Vibrations With VibraKill®

    Did ya know that vibrations can cause a scale's reading to bounce around from one weight to another? Included with this digital scale is a VibraKill® Pad to keep vibrations, (caused by everyday items like, your fridge, nearby music, your washing machine, etc...) from messing up your weighing.

  • 20 YEAR MANUFACTURER'S WARRANTY!

    If ya have a problem with this scale within the first twenty years ya own it, just send it in to the Jennings warranty center right here in the USA. They'll fix or replace your scale, and have it on it's way back to ya within two working days.

Additional Images
Animated image of the Mack's protective cover lifting up out of the way.
The Mack's rear display. The adjustable feet and level bubble on the Mack 20.
Available Accessories:
MACK AC Adapter
Old Will's Price: $5.50
 
Customer Reviews:
Great Scale!
I bought this scale to weigh small amounts of weight that I need to add to custom built golf clubs. The weight is either a screw-in, lead tape, or tungsten powder added down the shaft of the golf club; to make it have the correct swingweight and M.O.I. (moment of inertia). The first scale that I received didn't work right. It wouldn't power up? I called to order a replacement, and was promptly taken care of. The replacement scale arived in four days, and works perfectly! I highly recommend this company!
Reviewed by: Stephen Moxley from San Diego, Ca.. on 4/3/2012
Jennings Mack 20
I was looking for a scale to measure gunpowder that was accurate and without breaking the bank. I called and spoke with customer rep Allison who was most helpful and she directed me to the Mack 20. I also purchased the optional AC power adapter. I rcvd it in the mail a few days later and that night I used it with no problems. The next evening I reloaded more rifle rounds and found the scale would not calibrate. A call to OldWillKnott customer service the next day had me another scale on the way at no charge. The first scale was defective . I have now used the scale several times since and I can measure to 1/10th of a grain and repeat the same with no drift in measurements. This to me is important since I am using gunpowder and do not want to see different random measures. I am currently using the scale with 4AA batteries and like the auto shutoff feature if I forget to turn the unit off maually. So far I have been really pleased with my scale. Customer service here deserves 2 thumbs up too. Good job everyone! Thanks from a pleased customer. John
Reviewed by: John from Alabama. on 3/28/2012
Browse Similar Items:
Precision Scale, Precision Balances, Accurate Scales
Every Weight Scale Found At Old Will Knott Scales
Weighing Scales By Price: $50.00 - $75.00
Portable Scales, Battery Operated Scales
Precision Scale, Precision Balances, Accurate Scales > Precision Balances - 0.01 Gram to 0.05 Gram Resolution
Jewelry Scales, Diamond Scales, Gold Scales > Jewelry Scales - 0.01 Gram to 0.05 Gram Resolution
Jennings / JScale Digital Scales

Why Do So Many Folks Buy Scales From Old Will?
Facebook Icon Twitter Icon Blogger Icon
Free Scale Friday Icon
Sign Up For Our Newsletter