GP-20K Precision Scale from A&D Weighing

Readability (mg) 100
Capacity (g) 21000
Stabilization Time (sec) 1.5
Repeatability (mg) 100
Pan Size (mm) 384
Internal Calibration Yes
RS-232 Yes
Bluetooth No
USB Yes
PS2 No
WiFi No
Ethernet Yes
Display Alpha Numeric LCD
ISO Yes
GLP Yes
GMP Yes
GCP No
Mobile App No

With multiple options available when buying a 100mg readability Precision Scale, Lab.Equipment can make things a lot easier for you! Learn how the A&D Weighing GP-20K suits your needs. If it does not make your cut, go over our review, FAQ, and comparison of the GP-20K to other Precision Scales below to find the right unit for your requirements.

Lab.Equipment offers 185 Precision Scales from all 8 Precision Scale manufacturers such as A&D Weighing. Unlike every other single distributor shoving a catalog in front of your face displaying the exact same buzz words, terminologies, and propriety terms each manufacturer has “made up” to perplex us diligent lab staffs, we cut through the noise with true descriptions carefully written for you. We provide apples-to-apples comparisons of analytical balance performance. Trust us to assist you in saving valuable time and ensuring you acquire the best Precision Scale for your needs whether it is with this A&D Weighing GP-20K or not.


How accurate and sensitive is the A&D Weighing GP-20K Precision Scale against other 100mg readability balances available?

GP-20K Readability

With a readability of 100mg, the GP-20K is capable of handling most simple weighing tasks within your lab. The GP-20K is part of the A&D Weighing GP series best for applications like laboratory testing and chemical analysis.


How precise is the GP-20K Precision Scale compared to other 100mg readability balances?

GP-20K Repeatability

The GP-20K offers 100mg repeatability. Typically expressed as standard deviation and essential to constantly producing the same results when the same weight is placed on the lab balance several times, repeatability is one factor that can prove accuracy and validity.


What is the response time of the GP-20K Precision Scale compared to other 100mg readability balances?

GP-20K Stabilization Time

The time that the GP-20K balance takes to stabilize from the time you put your sample on it and displays results is 1.5 seconds.


Looking for a PDF quote for the A&D Weighing GP-20K Precision Scale?

We will not waste your time playing phone tag with a high pressure sales rep, simply use the Instant Quote tool above and you will get a quote emailed to your inbox within 30 seconds! No pesky sales reps calling on you we promise.


How do you calibrate the GP-20K?

Avoid noticeable changes when it comes to measuring results. Easily calibrate the A&D Weighing GP-20K thanks to its intuitive Internal Calibration.


What size of samples can I weigh on a GP-20K with a 100mg readability range?

GP-20K Pan Size

With a 384mm maximum diameter pan size

Weighing Capacity

The GP-20K provides a weighing capacity of 21,000g capable of handling quite larger samples compared to other models.


Other significant features of the A&D Weighing GP-20K Precision Scale

GP-20K Display ScreenFeaturing a responsive Alpha Numeric display, simply document measurements without the need to have the GP-20K wired to a computer.Accreditations of the A&D Weighing GP-20K Precision Scale

The GP-20K is compliant to ISO, GLP, GMP regulations.


Frequently Asked Questions for the GP-20K Precision Scale:

Will the GP-20K connect to your printer?

Since the GP-20K does have a USB port, you can attach it to a printer. If you already have an RS232 printer, it will also work on the included RS232 port of the GP-20K.

Will the GP-20K connect to your lab's network?

The GP-20K does not have a built in Wi-Fi. But the GP-20K does have a built in Ethernet port so you can connect it over your existing wired network.

Do you have any questions about the A&D Weighing GP-20K Analytical Balance that we missed answering for you here?

Just ask via live chat to the right, our Contact Us page, or email help@lab.equipment and we will get back to you with a prompt and friendly response.




  • IP65 rated, all-metal body, stainless steel pan

  • Read display at any angle

  • 12 units, comparator, %, counting functions

  • Time & date stamp built-in

  • User calibration function

  • 5 year warranty


For higher capacity weighing with the choice of an adjustable swing arm display (GP) or mountable detached display (GP-S). SmartRange feature for improved precision, regardless of tare container weight.

Internal Calibration

The GP internal calibration with an internal mass saves time and money. External calibration requires a great deal of skill, time and an expensive external mass. With our internal calibration with internal mass, the balance is calibrated very quickly. ■ Automatic Self Calibration — Self-calibrates automatically when the balance detects ambient temperature changes.

■ One Touch Automatic Calibration — Allows you to calibrate the balance on demand with just the push of a button.

■ Calibration is essential for accuracy in weighing. For example, in high-resolution balances, changes in sensitivity drift can be caused by changes in the ambient temperature. Take the GP-30K for example, the weight might change by 0.9g with a change of 10˚C ( Sample’s weight: 30kg ).

■ Thanks to our Double Leveraged Super Hybrid Sensor, the GP's motor-driven internal calibration mass is equivalent to a 50kg calibration mass in terms of top loading capacity on the weighing pan. The adjusted weighing accuracy is within +–15 digits in relation to the weighing capacity while conforming to the OIML's Class II balances definitions after using GP's internal calibration mass.

Standard Win

CTWinCT (Windows Communication Tools Software), provides easy transmission of weighing data from A&Dbalances to a computer using the RS-232C interface. Speed of data transfer into Windows applications in a manageable format is limited only by the computer’s capabilities.

RS-232C Interface

Using a USB/ RS-232C Converter, you can transfer data between a USB-equipped PC and a GP balance. This also makes your GP balance hot-swappable meaning that there is no need to turn the balance and/or computer off before disconnecting the balance.

For over 40 years, A&D Weighing has been providing advanced and accurate measurement instruments for a diverse range of markets including Research, Industrial Protection, Jewelry, and Food Processing. One of the trusted names when it comes to precision measurement and product inspection, A&D Weighing delivers an innovative line of electronic balances, digital scales, weighing indicators and controllers, load cells, and non-destructive measurement equipment. Complying to ISO:9001-2008 standards, A&D manufactures high quality products from worldwide operations in the US, Japan, Germany, Australia, Great Britain, and Korea and serves the Americas from its headquarters in Silicon Valley, San Jose, CA. Trust A&D to prove performance with its 5-year warranty on all microbalances, analytical balances, and precision scales.

A&D’s product line available on Lab.Equipment is comprised of the following:

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Ethernet: Yes
Mobile App: No
[Lab Balance] Bluetooth: No
[Lab Balance] Capacity (g): 21000
[Lab Balance] Display: Alpha Numeric LCD
[Lab Balance] GCP: No
[Lab Balance] GLP: Yes
[Lab Balance] GMP: Yes
[Lab Balance] ISO: Yes
[Lab Balance] Internal Calibration: Yes
[Lab Balance] PS2: No
[Lab Balance] Pan Size (mm): 384
[Lab Balance] RS-232: Yes
[Lab Balance] Readability (mg): 100
[Lab Balance] Repeatability (mg): 100
[Lab Balance] Stabilization Time (sec): 1.5
[Lab Balance] USB: Yes
[Lab Balance] WiFi: No

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