What We Offer

OIML Weights & Weights Sets OIML Weights & Weights Sets - Our Precision Weights conform to the standard of the Organization International de Metrologie Legale (OIML) International Recommendation R111-1 Edition 2004(E).

Weights are required for used in all the research & development, industries, commerce, laboratories, pharmaceuticals and every standard business, official bodies are required these high precision classified weights and weights sets to fulfill their Quality Standards such as ISO 9001:2015, GLP - Good Laboratory Practice, GMP - Good Manufacturing Practice. They are manufactured of Austenitic Stainless Steel with low magnetic permeability and high resistance to corrosion. All surfaces are polished to a perfect, mirror like finish.

Our precision weights are available in Classes E1, E2, F1 and F2. Weights specifications are designed so the specification on all surfaces finish, marking, construction, material density and magnetic properties get more restrictive as the weight tolerances get smaller in order to enable the weight to maintain its tolerances over time. The tolerances for the various classes are established in a manner that enables weights of higher classes to calibrate weights of the next lowest class. Example: Class E2 weights can be used to calibrate class F1 weights.

To get the proper accuracy from your weighing balances provides, you need to perform routine Calibration & Adjustments using the Precision Calibration Weights. Always use the Standard Weights one class ahead than the readability of the weighing balance by that you will get the proper results of your balance. An example that an electronic balance used by a jeweler which gives the result of Accuracy Class M1 then the accuracy of that balance is to be verified by the weights of Accuracy Class F2 weights.

OIML R 111-1:2004 - This international document describes the physical characteristics and metrological requirements of weights that are used for the verification of weighing instruments, for the verification of weights of a lower class of accuracy and with weighing instruments. This document includes a recommendation for seven classes from E1, E2, F1, F2, M1, M2, M3 of weights in tiers of uncertainty. Please see the Table of Tolerances Chart on the tolerances of each weight of a given OIML Class.

Class E1 - Used as primary reference standard for calibrating other reference standard and weights where the stability of the environment and careful handling are assured. Although very stable, one-piece construction Class E1 weights have no method of adjustment and are not suitable for general laboratory use.

Class E2 - Used as reference standard for calibrating other weights and is appropriate for calibrating high precision analytical balances with readability as low as 0.1 mg to 0.01 mg. Class E2 weights can also be used to calibrate Class F1 weights.

Class F1 - Used for calibrating high precision top loading balances with a readability as low as 0.01 g to 0.001 g. Class F1 weights can also be used to calibrate Class F2 weights.

Class F2 - Used for calibrating semi analytical balances and for student use. Class F2 weights can also be used to calibrate weighing instruments for important commercial transaction like gold and precious stones. Class F2 weights can also be used to calibrate Class M1 weights.

Class M1, M2, M3 - Economical weights for general laboratory, industrial, commercial, technical and educational use.

Contruction & Shape

As specified in OIML R-111, Weightronics Precision Weights are available in one or two-piece construction.

• Precision Weights of 500 mg and below are made up of sheet metal and are one-piece construction with one side turned up to make them easy to handle with forceps. Corners and edges are smooth. There are no markings permitted on any sheet metal weights 500 mg and below. The nominal values of weights 500 mg and below are determined by the shape of the weight according to the following table.





• Precision Weights of 500 mg and also available in wire construction as opposed to sheet metal with the same shape configuration as listed in the above table. Our wire weights have one end turned up as well to allow for easy handling with forceps. The nominal values of weights 500 mg and below are determined by the shape of the weight according to the following table.





• Precision Weights 1 g and above can be either one or two-piece construction. Our OIML Precision Weights 1 g and larger are cylindrical in shape with a tapered neck for easy gripping. They are perfectly flat on top to stack easily on centre. Weights bottoms are slightly recessed to expose the smallest possible area to wear.





• One-piece construction indicates the weight is manufactured from a single uniform piece of raw material, the weight has no other material added to it, and it has no method of adjustment other than removing material by grinding or polishing. One-piece weights are difficult to manufacture as the only method of final adjustment is removing material by fine grinding or polishing. Class E1 and E2 weights 1 g and larger are cylindrical in shape and are of One-piece construction.
• Two-piece construction indicates that the weight is constructed of multiple pieces of raw material. In our Precision Weights, weight body is constructed from one piece of material and the lifting knob or head is constructed from a different piece of raw material. Although the head and body may come from different bars of raw material, they are the same grade and type of raw material with the same densities. The knob or head typically screws into the body and one can barely tell the weight is not constructed of one piece of material. There is cavity below the knob thread in the body, which contains adjusting material that is typically the same material from which the weight is made. Class F1 and F2 weights 1 g and larger are cylindrical in shape and are of two-piece construction.

Presentation

Our weights sets have the same features as the individual weights of their corresponding class. Our weights and weights sets of Accuracy Class E1, E2, F1, F2, M1 shall be supplied in different 3 Options like Fine Polished Steam Beach Handmade Strong Wooden Boxes padded with velvet, Finished Plastic Boxes padded with Foam, Fine Stainless Steel-304 Boxes padded with Foam, along with the matching accessories like forceps for lifting the fractional and smaller weights, brush and Piece of Chamois Leather for cleaning the weights, gloves for not to touch weights with naked hands which is prohibited.

Weights Set Information

Our weights sets have the same features as the individual weights of their corresponding class. Our weights and weights sets of Accuracy Class E1, E2, F1, F2 shall be supplied in different 2 Options like Fine Polished Steam Beach Handmade Strong Wooden Boxes padded with velvet and Fine Stainless Steel-304 Boxes padded with Foam, along with the matching accessories like forceps for lifting the fractional and smaller weights, brush and Piece of Chamois Leather for cleaning the weights, gloves for not to touch weights with naked hands which is prohibited.

Accessories

We also provide you all the accessories you need to properly handle and protect your Precision Weights and Weights Sets. Please contact us for information on new cases, replacement cases or special cases you need to store and protect your Precision Weights and Weights Sets.

Calibration Services

WMCL - Weightronics Mass Calibration Laboratory is an independent mass calibration laboratory. WMCL have the capabilities of providing mass calibrations from 1 mg to 1000 kg. Our philosophy is to provide the highest level of quality calibration by pursuing every measurement detail in order to achieve the most accurate and repeatable calibration in the industry. Starting with a stable and tightly controlled environment, followed by using the finest equipment available, with highly trained personnel executing proven procedures, we produce a precise measurement. Our goal is to provide our customers with the lowest measurement uncertainties achievable.

World Class Calibration Facilities

Weightronics Mass Calibration Laboratory was constructed to meet the strict environmental guidelines. In order to maintain the strictly controlled environment, the Mass Calibration Laboratory were designed and constructed within a building. The climate in the Mass Calibration Laboratory is strictly monitored and controlled having its own systems. Temperature & Relative Humidity in the laboratory is measured and maintained as below:

Barometric pressure resolution is 1 mbar.

Although the temperature and humidity are tightly measured and controlled, the design of the air handling system allows for minimal air velocity, so air currents are kept to a minimum.

State of Art Equipments

Our Mass Comparators used in Weightronics Mass Calibration Laboratory are state-of-the-art with the highest precision possible. WMCL can measure as precisely as 0.0001 mg as we are having the 5 mass comparators ranging from: 6.1 g x 0.1 ug, 211 g x 1 ug, 2300 g x 0.1 mg, 10100 g x 1 mg, 64.1 kg x 5 mg. All comparator rests on anti vibration pads on a marble table which also rests on the anti vibration pads to reduce effects from vibration. All comparators are interfaced to a host computer outside the laboratory for processing calibration data. Our customized software programs ensure the accuracy of the data collection and calculation process. WMCL engineers and calibrators take more precautions to ensure that these high accuracy instruments will work to their maximum level of Accuracy.

Unmatched Standards

Weightronics Mass Calibration Laboratory traceability back to nationally recognized standards is guaranteed. Direct traceability to NPL - National Physical Laboratory, INDIA is achieved and maintained through the use of several standards that are not only returned to NPL on a regular schedule, but also are intercom pared in our laboratories to monitor their stability.

Highly Trained Personnel and Proven Calibration Procedures

World-class metrology facilities and state-of-the-art calibration equipments are only as good as the people who manage the measurement process. WMCL has the staff of certified engineers and NPL trained calibrators who adhere to strictly established metrology practices in order to provide low statistical uncertainties second only to NPL. WMCL procedures utilize multiple standards during a calibration to assure accuracy of the process and to validate the standards. If a measurement does not pass statistical tests calculated during each calibration, then the measurements are repeated and investigation is initiated to find the root cause of the failure.

Recalibration for Any Brand Names, Manufacturers and Designs

We shall recalibrate and certify virtually any size or type of weights from 1 mg to 1 000 kg from any manufacturer.

We offers recalibration service along with calibration certificates for all weights ranging from 1 mg to 1000 kg, regardless to their accuracy class from E1, E2, F1, F2, M1, M2, M3 weights.

Recalibration of weights depending upon that how frequently weights are used, they must be recalibrated on a regular basis so that they meet the requirements for reliable measuring, inspection and test equipments.

In addition to adjustment and recalibration, our refinishing services can return your used weights to like new condition with precise polishing and refinishing. This will extend the life of your weights and weights sets and helps to avoid costly replacements. Weights cases can be restored and replaced also.

Accreditation

WMCL focus is to achieve the highest levels of accreditations for weights, mass standards and calibration services. Accreditations assure our customers that WMCL meets and maintains the most rigorous testing and manufacturing standards. Since 2008, WMCL is an Accredited Calibration Laboratory. The combination of a highly trained staff, controlled physical conditions and precise equipment enable Weightronics Mass Calibration Laboratories to produce mass metrology with very small uncertainties.