Radwag MYA 21.4Y PLUS Microbalance


Maximum capacity [Max]: 21g

Readability [d]: 1µg
The MYA 4Y PLUS microbalance is a professional instrument intended for the most demanding applications. The innovative SYNERGY LAB line guarantees the highest quality, precision and reliability. The best possible repeatability and USP regulations conformity
The best weighing accuracy and repeatability – with sd ≤ 1d combined with USP regulations conformity (Section 41 and 1251) make 4Y PLUS balances a new standard for mass measurement quality.Ergonomic Mechanical Design
The MYA 4Y PLUS microbalance features construction solutions ensuring convenient everyday operation. The weighing chamber can be disassembled without tools, which makes cleaning it convenient. Programmable infrared sensors, when respectively set, enable touchless opening and closing of the weighing chamber.

Antistatic Weighing Chamber
Specially designed antistatic panes coating compensates electrostatic charges accumulated on the sample and laboratory accessories. With this, the influence of electrostatics onto the weighing result is limited.

New autolevelling system in MYA 4Y PLUS microbalances ensures:

  • round tilt test,
  • automatic balance
  • control of the correct balance level,
  • confirmation of correct balance level on adjustment and weighing reports.

Innovative 2-Point Adjustment System
Brand new adjustment system guarantees the highest measurement accuracy. It minimizes linearity errors simultaneously providing reliable indications for the whole weighing range.


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Informasi Produk

Smart Min Weight
With use of the “Smart Min Weight” function, the MYA 4Y PLUS microbalance automatically adjusts resolution of the range to the currently weighed mass. This results with improvement of the minimum sample weight parameter by 30%.

Remote control operation
Wi-Fi® module offers wireless transfer of data recorded by MYA 4Y PLUS balance to any portable device powered by iOS or Android systems using special applications intended for data management.

Data safety
Every single MYA 4Y PLUS balance features ALIBI memory designed to provide protection and automatic recording of your measurements. Options such as data preview, copying and archiving are also
available to users.

Faster measurement with the new CPU
MYA 4Y PLUS microbalances feature Dual Core 2 x 1 GB processor which delivers noticeable performance improvements including faster operation and shorter stabilization time retaining high repeatability values.

16 GB RAM – more data management possibilities
16 GB RAM offers possibility of recording data in a form of complex reports. Time and statistic data diagrams on series of weighments are another useful option.

21 CFR Part 11 Compliance Module
MYA 4Y PLUS microbalances are compliant with 21 CFR part 11 and EU GMP part 4, annex 11. This means that the 4Y PLUS series features numerous functions for protecting and monitoring work results of particular operators.
Full data protection is ensured by:

  • advanced password settings,
  • verification of log-in operation correctness,
  • assigning permissions to operators,
  • auto log out,
  • electronic signature, e.g. for series of measurements,
  • granting/denying access to data management
  • data backup,
  • modifications saved to Audit Trail file.

Defined Profiles
Four predefined profiles enable automatic balance parameters customization.

  • FAST – the measurement result is obtained in a very short time,
  • FAST DOSING – the balance quickly reacts to mass changes, especially useful for dosing or adding more product to the dispensed portion,
  • PRECISION – balance settings providing the minimum standard deviation,
  • USER – customization of the parameters in accordance with operator’s requirements.

Filter weighing option
This innovative solution enables the user to easily swap the weighing chamber with the chamber for filter weighing, which considerably expands the MYA 4Y PLUS microbalance functionality. The filter weighing chamber is characterized by high ingress protection. Large open-work weighing pan allows precise weighing of filters of various dimensions (max ø100). It is made of stainless steel which makes the chamber resistant to chemicals, colour change and scratches. The additional chamber does not come standard with the MYA 4Y microbalance.




  • ALARM function
  • graphic level indicator
  • programmable acceptable tilts


  • update balance software
  • export weighing data
  • export/import databases
  • export/import balance settings
  • exchange data between balances


Optional functions:

  • PRINT function
  • TARE function
  • sensor’s sensitivity adjustment



Elimination of extra sources of vibration

Using wireless terminal facilitates elimination of additional vibrations resulting from daily operation on a balance. Owing to that, balances with highest resolutions might be used without the need of dedicated weighing workstations.

Convenience and comfort of weighing in fume cupboards and laminar flow cabins

Wireless communication between a terminal and a weighing module makes balance operation more comfortable and safer.

Balance isolation form influence of environmental conditions

Wireless communication allows to either place the weighing module inside a draft shield or to isolate it from the operator. This allows to weight toxic substances without putting operator’s health or life at risk.

Enhanced pipetting ergonomics

Pipettes calibration process requires both, measurements precision and fast operation. Radwag wireless communication creates a new dimension of comfort for your daily enjoyment.


  • Ethernet
  • 2×USB
  • 2×RS 232
  • 4 in / 4 out
  • WiFi 2,4GHz b,g,n


It minimizes linearity errors simultaneously providing reliable indications for the whole weighing range.


New autolevelling system PLUS series balances ensures:

  • ground tilt test,
  • automatic balance levelling,
  • control of the correct balance level,
  • confirmation of correct balance level on adjustment and weighing reports.


The ionizer neutralizes any uncompensated electric charge accumulated on the weighed object. The influence of static electricity gives greater repeatability error, often also greater error of indication.


PLUS balances automatically adjusts resolution of the range to the currently weighed mass.


Full data protection is ensured by:

  • advanced password settings,
  • verification of log-in operation correctness,
  • assigning permissions to operators,
  • auto log out,
  • electronic signature, e.g. for series of measurements,
  • granting/denying access to data management
  • data backup,
  • modifications saved to Audit Trail file.



Diagnostic function aiming at metrological parameters determination (repeatability), the parameters are determined for the actual conditions of use. When speaking of repeatability it may be also used for weighing time optimization. Autotest is operated in an automatic mode thus operator’s time is saved.


Weighing process for which reference mass has been determined together with tolerance for its determination. Dosing tolerance is given in [%] and it is calculated in relation to the reference value thus being a permissible deviation of this process. This solution is used for weighing powders, liquids and loose materials. Dosing function performance is often supported with bargraph – load indicator. For industrial scales it is possible to use a control systems of dosing process.


Percent Weighing function is used for comparision of measured products with mass standard. Mass of a mass standard may be a numeric value taken from a database or it may be determined through a measurement process. Each measured product is compared to mass standard, mass of which is presumed as a model 100% ideal mass. For products weighing less than the mass standard, obtained results are lower than 100%, for products weighing more, the obtained results are greatly  exceeded.


Function using mass measurement for determination of  measured items quantity. Mass of a single item is required for this process. It may be either estimated through weighment or taken from a database. For items counting the following algorithm is used: all items mass / single item mass = quantity. Function operation is supperted by a mechanism of Automatic Correction of Accuracy. This allows to update single item mass in course of the process. To a certain extend Automatic Correction of Accuracy eliminates error which may be a result of different mass values of seemingly alike single elements. For industry solutions items counting may be simultaneously carried out with checkweighing and dosing thus industry solutions feature audio signalling base informing that specified number of items has been weighed. It is possible to apply weighing systems using few platfroms of different MAX capacities and different accuracies.


Function supporting the mixture making process, wherein the mixture contains various components. Formulation function usually uses the balance/scale database of components. Formulation serves for monitored checkweighing of every single component with a given tolerance. It is enriched with a set of individual settings.


Statistiscs function registers and analyses performed measurements. This supplies the user withthe following information: Max and Min standard deviation, average value, variance, range et.


Checkweighing function is used for checking whether the measured sample mass is within the predefined threshold values, Low [LO] and Hgh [HI]. The thresholds are given in [g] and [kg] units. Current state of a sample being measured is signalled by means of pictorgams located on a display for laboratory balances, for industrial scales Stackligt System is used. This visual +/- inspection is in operation during segregation, control or packing process of products for which mass has bees determined with a specifaied tolerance, eg. 12860 g 961


Programmable function supporting the weighing process through control of the following options: sliding weighing chamber doors, printout, zeroing, tarring etc. Especially appreciated wherever preventing the balance from soiling is important.


Diagnostic function allowing to objectively document performed measurements. GLP procedures may be either presented in a short report form or extended one.


Process of mass determination for a product which may unwillingly reposition within the weighing pan. Mass determination in such cases requires much longer period of time when compared to typical weighing process. It is the user who defines period of time needed for control of measured product mass. The user can thus optimize the function depending on the measured product characteristics.


Function verifying correctness of piston pipettes functioning, the verification is performed via gravimetric measurement of the excreted liquid. Pipettes calibration may be either a stand-alone module or it may be operated


Function performing correction of mass measurement indication, wherein the air density is taken into account. It is used in balances with reading unit < 0,01 mg.


Automatic side panes opened via touch-free IR sensors.


Differential weighing informs about mass variation a particular sample, wherein the said variation is a result of manufacturing processes.

Differential weighing is often applied in product control process, for which reference product parameters have been specified in order to be used as a source of comparison for the whole series.

Insuchcasestandard deviation is the information which tells about quality and completeness of a final product. For systems based on a feed-back technique such information may be used by control units.


Replaceable units.


Statistical control for determination of basic statistical criteria: maximum, minimum, standard deviation, mean values for each batch, etc.


“ALIBI” memory enables saving and storing up to 100000 measurements.  Measurements are saved automatically upon each pressing of the key. There is no need for any additional operations or changing settings.

The following data related with the measurements is saved: measurement date; measurement time; result (mass); tare value; operator carrying out the measurement (logged in); product name.

The software saves the measurement in a so called loop, i.e. when the measurement no. 100001 is saved, the measurement 1 gets automatically deleted from the memory.

Measurements saved to balance memory cannot be deleted.

You can preview and print out the data saved to the ALIBI database.


Wi-Fi® offers possibility to send data from balance to a mobile iOS or Android device, via special data management apps. Wireless communication between the indicator and the weighing instrument enables operating the balance that is placed inside a laminar flow hood or a fume cupboard.


Maximum capacity [Max]21 g
Minimum load100 µg
Readability [d]1 µg
Tare range-21 g
Standard repeatability [5% Max]1 µg
Standard repeatability [Max]3 µg
Standard minimum weight (USP)2 mg
Standard minimum weight (U=1%, k=2)0.2 mg
Permissible repeatability [5% Max]1.6 µg
Permissible repeatability [Max]4 µg
Linearity±7 µg
Eccentric load deviation7 µg
Stabilization timemax 10 s
Adjustmentinternal (automatic)
Display5.7” resistive colour touchscreen
Communication interface2×RS232, 2×USB-A, Ethernet, 4 IN / 4 OUT (digital), Wi-Fi®
Power supply100 ÷ 240 V AC 50 / 60 Hz
Power consumption max.10 W
Operating temperature+10 ÷ +40 °C
Operating temperature change rate±0.3°C/1h (±1°C/8h)
Relative humidity40% ÷ 80%
Relative humidity change rate±1%/h (±4%/8h)
Weighing chamber dimensionsø90×90 mm
Weighing pan dimensionsø26 mm
Packaging dimensions660×660×455 mm
Net weight9.1 kg
Gross weight16.6 kg


  • Automatic pipettes
  • “Pipettes” PC software
  • Workstation for pipettes calibration
  • Granite Antivibration tables
  • Antivibration tables for laboratory balances
  • Professional weighing table
  • Audit Trial Reader
  • E2R System
  • Label Editor R02
  • Parameter Editor
  • R.Barcode
  • R-LAB
  • RADWAG Connect
  • RADWAG Development Studio
  • RADWAG Remote Desktop
  • labVIEW Driver
  • Chamber for filter weighing
  • Receipt Printer
  • Label Printers
  • Antistatic ionizer
  • THBR 2.0 System – Ambient Conditions Monitoring
  • RS 232 cables (scale-EPSON Printer)
  • USB Hubs
  • Moxa Uport 1110 Converter
  • RS 232, RS 485 cables
  • Protective cover for balances
  • Barcode Scanners
  • Holder for laboratory flasks
  • Holder for test tubes and filters
  • Anti-Draft Chamber for XA 4Y Balances
  • Displays
  • Power Adapters


21 CFR Part 11 Compliance Module

The 21 CFR Part 11 Compliance Module is a solution especially useful for those users who are obliged to conform to provisions of 21 CFR Part 11 and EU GMP Part 4, Annex 11 regulations. These two documents determine the rules for using electronic records and signatures.

Data protection is guaranteed by:

  • advanced password settings,
  • control of logging correctness, various permission levels,
  • data management access,
  • backup,
  • electronic signature,
  • time-defined automatic logout,
  • modification record to Audit Trail file.

The module features “Audit Trail” which registers each data modification (date, start value, modified value, operator responsible for the modification). This enables tracking all activities and modifying them in the future if required.
The Audit Trail Reader freeware allows users to acquire data from the weighing instrument and export it as files to pdf, xls, csv, html formats.


Our customer support team is here to answer your questions. Ask us anything!
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