Calibration Weights

Calibration Weights as per OIML R 111-1 Edition 2004(4) Type 1 are certified to be used to ensure that scales or balances are giving you accurate readings. Calibration weights are assigned a class which is based on the accuracy or tolerance of the weight. We are Leading Exporter of Calibration Weights from India. We Export Calibration Weights in Australia, Bahrain, Belgium, Botswana, Canada, Cyprus, Eswatini, France, Germany, Ghana, Ireland, Israel, Kenya, Kuwait, Malta, Malawi, Mauritius, Mozambique, Namibia, New Zealand, Netherland, Oman, Romania, Saudi Arabia, Singapore, South Africa, Tanzania, Thailand, Taiwan, United Arab Emirates, United Kingdom and USA.

OIML: The Organisation Internationale de Métrologie Légale or International Organization of Legal Metrology (OIML) is an intergovernmental organization that provides standards and systems with the goal of harmonizing legal metrology procedures. From lowest (most accurate) to highest tolerance, OIML has classified the Calibration Weights in accuracy classes as E1, E2, F1, F2, M1, M2, and M3.

Tolerance Levels

The following tables shows the tolerance levels for the different classes of weights, as per OIML.:

	E1	E2	F1	F2	M1	M2	M3
	mg	mg	mg	mg	mg	mg	mg
5000 kg			25000	80000	250000	800000	2500000
2000 kg			10000	30000	100000	300000	1000000
1000 kg		1600	5000	16000	50000	160000	500000
500 kg		800	2500	8000	25000	80000	250000
200 kg		300	1000	3000	10000	30000	100000
100 kg		160	500	1600	5000	16000	50000
50 kg	25	80	250	800	2500	8000	25000
20 kg	10	30	100	300	1000	3000	10000
10 kg	5	16	50	160	500	1600	5000
5 kg	2.5	8.0	25	80	250	800	2500
2 kg	1	3	10	30	100	300	1000
1 kg	0.5	1.6	5	16	50	160	500
500 g	0.25	0.8	2.5	8.0	25	80	250
200 g	0.1	0.3	1.0	3	10	30	100
100 g	0.05	0.16	0.5	1.6	5.0	16	50
50 g	0.03	0.10	0.3	1.0	3.0	10	30
20 g	0.025	0.08	0.25	0.8	2.5	8.0	25
10 g	0.020	0.06	0.20	0.6	2.0	6.0	20
5 g	0.016	0.05	0.16	0.5	1.6	5.0	16
2 g	0.012	0.04	0.12	0.4	1.2	4.0	12
1 g	0.010	0.03	0.10	0.3	1.0	3.0	10
500 mg	0.008	0.025	0.08	0.25	0.8	2.5
200 mg	0.006	0.020	0.06	0.20	0.6	2.0
100 mg	0.005	0.016	0.05	0.16	0.5	1.6
50 mg	0.004	0.012	0.04	0.12	0.4
20 mg	0.003	0.010	0.030	0.10	0.30
10 mg	0.003	0.008	0.025	0.08	0.25
5 mg	0.003	0.006	0.020	0.06	0.20
2 mg	0.003	0.006	0.020	0.06	0.20
1 mg	0.003	0.006	0.020	0.06	0.20

Certifications of Weights

While browsing Calibration Weights, you might come across mentions of certifications. Indeed, depending on your application, you may require that your calibration weights come with a certificate confirming that the lab testing the weights is accredited.

ISO/IEC 17025: The International Organization for Standardization (ISO) is an independent non-governmental organization comprising a membership of 164 national standards bodies. The International Electrochemical Commission (IEC) is an international standards organization for electrotechnical fields. Together with other liaison organizations, they created the ISO/IEC 17025 standards. This is the international reference to be used by testing and calibration laboratories that want to display their ability to provide reliable results.

as per

Calibration Weights

To ensure the accurate performance of your weighing scales or balances, it is essential to regularly assess them using calibrated weights. The frequency of these checks—whether daily, weekly, or monthly—depends on the criticality of the measurements to your product or process and the potential consequences of any deviation from tolerance in your weighing equipment.

Cast Iron Bar and Hex Calibration Weights: These weights are the most frequently used for testing industrial, commercial, and retail scales. They are typically adjusted to the M1 tolerance or class, which translates to an accuracy of 1:20,000 or 0.005%. For instance, a 20 kg (20,000g) calibration weight with M1 accuracy will have a maximum error, as supplied, of +/-1g. Please refer to the Weight Classes section for more details.

Cast iron bar and hex calibration weights are designed for single-person handling. The smaller weights, such as 5 kg, 10 kg, 20 kg, and 25 kg, are referred to as bar weights due to the handlebar, while those ranging from 100g to 2 kg have a hexagonal shape. We recommend M1 cast iron calibration weights for checking and calibrating scales with a resolution (readability) of 1g or more. They offer stability in dry environments and are a cost-effective choice compared to other options.