Lab testing, calibration, stamping & verification in legal metrology is a legal process that assures all weighing and measuring instruments used in trade, industry, or healthcare are accurate, approved, and compliant with government standards. This procedure protects both businesses and consumers and is mandatory under the Legal Metrology Act, 2009. Whether you’re a shop owner or manufacturer, following this procedure helps you avoid penalties and build trust.
What is the Lab Testing, Calibration, Stamping & Verification in Legal Metrology?
Lab testing, Calibration, Stamping, & Verification in Legal Metrology is a procedure that ensures all weighing and measuring instruments used in trade, healthcare, or industry are accurate, standardized, and legally approved for use in India.
- Lab Testing in Legal Metrology – Lab testing is the technical examination of an instrument in a government or NABL-approved lab to check its performance and safety.
- Calibration in Legal Metrology – Calibration means setting and adjusting an instrument so it shows accurate measurement.
- Verification in Legal Metrology – Verification is an official inspection done by the Legal Metrology Officer (LMO) after calibration.
- Stamping in Legal Metrology – Stamping is the final step in the process. Once the instrument passes verification, the officer puts an official seal or stamp on it.
Why is Lab Testing and Calibration Important for Weights and Measuring Instruments?
Lab testing and calibration of weights and measuring instruments are very important to make sure that the instruments used in shops, factories, hospitals, fuel stations, and other businesses give the correct and accurate results.
What is the Difference Between Calibration, Verification, and Stamping?
Here we have created a table to define the difference between calibration, verification, and stamping:
| S.No. | Process | Meaning | Who Performs It? | Purpose | When It’s Done | Includes |
|---|---|---|---|---|---|---|
| 1. | Calibration | Adjusting the measuring instrument to show accurate readings by comparing with standard values | Certified lab or trained technician | To ensure the instruments give correct measurements | Before use, or periodically to maintain accuracy | Lab Testing and calibration in legal metrology |
| 2. | Verification | Official check to confirm the instrument meets legal metrology standards | Legal Metrology Officer (LMO) | To certify that the device is legally fit for use | After Calibration, or annually as per the Legal Metrology Act | Verification in legal metrology |
| 3. | Stamping | Sealing the instruments with an official mark after successful verification | Legal Metrology Officer (LMO) | To provide legal approval and proof of compliance | After verification is completed and passed | Stamping in legal metrology |
Easy Procedure for Lab Testing, Calibration, Stamping & Verification of Weighing Instruments
Here we have listed the easy procedure for lab testing, calibration, stamping, and verification of weighing instruments:
- Submit Application – Apply to your legal metrology department or an approved test lab, fill in the form with your details and instrument type.
- Schedule a Visit or send Instruments – Either take the instruments to the legal metrology office, or request the officer to visit your premises.
- Lab Testing & Calibration – The instruments are tested in a certified lab or by a trained technician, and it’s calibrated using standard weights to make sure it show the correct value.
- Official Verification – After calibration, a legal metrology officer (LMO) checks the instrument. The officer ensures it meets all legal and technical standards.
- Stamping – If the instrument passes the verification, the officer seals it with a stamp. The stamp includes the date and the next due verification
- Receive Certificate – You will receive a verification certificate for your records. This proves your instrument is approved and ready to use.
Documents Required for Lab Testing, Calibration, and Stamping of Instruments
Check the list of all the required documents for lab testing, calibration, and stamping of instruments:
- Application Form
- Copy of GST Registration Certificate
- Copy of PAN Card
- Address Proof of Business Premises
- IF Proof of the Applicant
- Previous Verification Certificate
- Purchase Invoice of the Instruments
- Model Approval Certificate
- Trade License/Shop & Establishment Certificate
- Declaration or Undertaking
How Long Does the Lab Testing and Stamping Process Take?
Basically, the time it takes according to the procedure to get the lab testing and stamping process, check out the table to understand it:
| S.No. | Stage | Estimated Time |
|---|---|---|
| 1. | Application Submission | 1 day |
| 2. | Lab Testing and Calibration | 1 to 3 days |
| 3. | Verification by Legal Metr | 1 to 2 days |
| 4. | Stamping and Issuance of Certificates | 2 to 10 days |
What is the Validity Period of Legal Metrology Calibration & Stamping?
The legal metrology calibration and stamping validity depend entirely on the type of instrument, but it is usually valid for 1 year.
Penalties for Non-Compliance With Lab Testing & Stamping Requirements
| S.No. | Type of Non-Compliance | Penalty/Action | Remarks |
|---|---|---|---|
| 1. | Using instruments without lab testing & stamping | Fine up to Rs. 25,000 | First time offence under the Legal Metrology Act, 2009 |
| 2. | Using an expired or unstamped weighing/measuring device | Seizure or sealing of the instruments | An officer can confiscate the device on the spot |
| 3. | Using unapproved or faulty instruments repeatedly | Higher fine or imprisonment | Repeated violations lead to stricter action |
| 4. | No record of calibration or verification | Legal notice and inquiry | Record maintenance is mandatory |
| 5. | Tampering with stamped instruments | Prosecution and cancellation of the license | Considered a serious offence |
How Can ELT Corporate Assist With Lab Testing, Calibration, Stamping & Verification Compliance?
Managing lab testing, calibration, stamping & verification can be confusing and time-consuming, especially when dealing with legal metrology act rules. This is where Elt Corporate, one of the best regulatory consultancies in India, can help you stay compliant without any hassle.
- End-to-End Support
- Quick Documents Preparation
- Booking Appointment
- Follow Up with Departments
- Annual Compliance Reminders
- PAN India service coverage
- Affordable Packages
Is Lab Testing and Stamping Mandatory for All Weighing Instruments?
Yes, lab testing and stamping are mandatory for all weighing instruments used in trade, industry, and healthcare.
Can I Use My Weighing Scale Without Verification if it’s New?
No, you can not use a weighing scale without verification if it’s new, as it is illegal.