Weight Calibration Services

Rice Lake Weighing Systems’ mass calibration laboratory features an industry-leading four-day turnaround with direct traceability to NIST. Our expert metrology staff stays up-to-date on the latest industry trends and requirements and are ready to assist and answer your questions.

Recalibration Form PDF

Welcome

Welcome

Welcome to Rice Lake Weighing Systems mass calibration laboratory. Our full-time staff with over 200 years of combined experience are the industry-leading experts in calibration services and test weight selection.

NVLAP accredited

The National Voluntary Laboratory Accreditation Program (NVLAP) is a National Institute of Standards and Technology (NIST) program in the United States, which provides an unbiased third-party test and evaluation program to accredit laboratories. Please click HERE to access our accreditation certificate.

Rice Lake Weighing Systems' mass calibration laboratory is also a full member of the following organizations:

  • ILAC – International Laboratory Accreditation Cooperation
  • APLAC – Asia Pacific Laboratory Accreditation Cooperation
  • IAAC – Inter American Accreditation Cooperation

The lab was also audited for compliance to ILAC P14:01/2013 ILAC Policy for Uncertainty in Calibration.

Calibration Services – Four-Day Turnaround

Virtually all of our test weight recalibration and certification services receive an industry-leading four-day turnaround. If you need a custom solution, we manufacture custom test weight values and sizes. Our staff is ready to assist and answer your questions. Please call 800-472-6703 for assistance in quoting the correct service for your needs. You may also submit the form below.

Recalibration Form PDF
Statement of Decontamination Form

Packing your weights

To ensure your test weights arrive at our lab safely, please follow the steps outlined below.

1. Secure Your Weights

All weight sets need to be secure in their case. Even accessories such as milligram covers need to be protected so they cannot move.

2. Use Foam or Bubble Wrap

Wrap small cases and individual weights in foam or bubble wrap. Packing peanuts create static electricity. Please do not use them to pack your weights.

3. Pack Your P.O.

Include with your properly packed weights a copy of your quote, purchase order or a copy of the recalibration form. This information will ensure that your weights will receive the desired service and quickest turnaround time.

4. Separate Heavy Weights

Large weights, 20 pounds and 10 kilograms or heavier, should be packaged in individual boxes.

5. Do Not Mix Weights

To ensure your weights arrive safely, do not package stainless steel weights with cast iron weights.

Contact information

To speak with one of our test weight experts, please call 800-472-6703 or email prodinfo@ricelake.com

Traceability

What is Traceability?

Traceability is documentation, essentially a pedigree, showing a direct link to the official U.S. one kilogram weight standard housed at the National Institute of Standards and Technology (NIST) in Gaithersburg, Md. These NIST standards are in turn calibrated to the international one kilogram standard maintained at the SI (International Standard) lab in Sevres, France.

Traceability not only means that a weight or mass standard has links to the NIST one kilogram standard, but also that the measurements were appropriate for the accuracy class required for the application. Traceability also requires proof that all environmental factors affecting accuracy were considered at the lab doing the measurement.

So when is traceability necessary?

  • Federal agencies require measurement traceability to national standards for contract work.
  • Military contracts invariably require traceability.
  • Pharmaceutical, scientific and medical products manufacturers usually specify traceability.
  • ISO 9000 registered companies nearly always require proof of traceability to the international standard.

Direct Traceability

Direct traceability means a weight or mass standard has been tested by NIST. NIST then issues a report number to the organization for whom they have performed measurements. Because the certificate is valid only for the items tested by NIST, a calibration lab such as Rice Lake Weighing Systems must submit its set of mass standards to NIST for testing. This certificate provides direct traceability for the lab’s mass standards, which can then be used in calibrating weights for clients.

Indirect Traceability

Indirect traceability exists when a client’s weight or mass standard is tested by a metrology lab that has direct traceability and has the necessary measurement control program in place. An important aspect of this measurement control and testing program is the participation in a NIST-certified measurement assurance program, which reduces the possibility of errors.

To clarify the two types of traceability, remember that direct traceability comes directly from NIST. For example, Rice Lake Weighing Systems’ calibration lab has direct traceability, as shown in the diagram below. The calibrations we perform for our customers provide indirect traceability. Likewise, when that customer uses its Rice Lake Weighing Systems calibrated test weights to calibrate a balance or scale, it is providing indirect traceability.


Certificates


Calibration Certificate

A customer requesting a Calibration Certificate needing traceability to NIST is looking for actual weight readings, corrections and uncertainty values. To produce this document, a calibration laboratory must maintain a statistical measurement process acceptable by NIST. Also, depending on the weight class and the accuracy required, different standards and procedures need to be incorporated to make sure the level of uncertainty is appropriate for the item being tested. The Weight Calibration Certificate is in compliance with ISO International Standard 17025 and ANSI/NCSL Z540-1 requirements.

The special software used to produce the Calibration Certificate was developed specifically for Rice Lake Weighing Systems.

These programs and procedures allow Rice Lake Weighing Systems to achieve and help maintain lower uncertainties.

1
Name and address of the calibration laboratory
2
Contractor name and address
3
Client name and address
4
Environmental condition at time of test
5
Your Traceable Certificate number
6
NIST Certificate number
 
Procedure used:
7
Mass Dissemination
8
Identification of the calibrated item and serial number, if applicable
9
Nominal mass value
10
As found condition of the weight before adjustment
11
As left condition of the weight
12
A statement of the estimated value of uncertainty1
13
Tolerance for the specific class
14
Record of the weighing equipment
15
Calibration and due date of RLWS standards. This represents the date that RLWS standard is due for recalibration. This RLWS standard was used to check the performance of your weight. This date in no way reflects an expiration date of the certificate, nor does it infer or specify a recall date. The expiration of the certificate and the specification of a recall date are user assigned responsibilities under NIST H150-1.
16
Assumed density of the weight being tested
17
Date Calibrated
18
Recall Date
19
The NVLAP official logo will be displayed when the documentation meets the scope of accreditation under Lab Code 105001
20
Conventional Mass - mass that weight weighs at 20° C in air of density of 1.2 mg/cm3 against a standard density of 8.0 g/cm3.


Procedure Used:
Mass Dissemination using NIST SOP 5, NIST SOP 28

Traceable Certificate

A customer requesting a Traceable Certificate needs proof of traceability to NIST, actual mass values and uncertainties. Comparisons must be made between the item being tested and a known standard being used. The laboratory performing the testing must verify that the proper procedures and standards are being used so that the uncertainties are suitable for the test that is required. The known standard and procedure used for the tolerance test is essential to the traceable document. The Traceable Certificate is in compliance with ISO International Standard 17025 and ANSI/NCSL 2540-1 requirements.

Prior to the comparison between the known standard and the item(s) submitted for test, the known standard must be sufficiently tested over time to produce predictable measurements. Also, the procedure used to do the comparison must be accurate enough so the uncertainty of the measurement is small enough to generate a valid certificate.

1
Name and address of the calibration laboratory
2
Contractor name and address
3
Client name and address
4
Environmental condition at time of test
5
Your Traceable Certificate number
6
NIST Certificate number
 
Procedure used:
7
Mass Dissemination
8
Identification of the calibrated item and serial number, if applicable
9
Nominal mass value
10
As found condition of the weight before adjustment
11
As left condition of the weight
12
A statement of the estimated value of uncertainty1
13
Tolerance for the specific class
14
Record of the weighing equipment
15
Calibration and due date of RLWS standards. This represents the date that RLWS standard is due for recalibration. This RLWS standard was used to check the performance of your weight. This date in no way reflects an expiration date of the certificate, nor does it infer or specify a recall date. The expiration of the certificate and the specification of a recall date are user assigned responsibilities under NIST H150-1.
16
Assumed density of the weight being tested
17
Date Calibrated
18
Recall Date
19
The NVLAP official logo will be displayed when the documentation meets the scope of accreditation under Lab Code 105001
20
Conventional Mass - mass that weight weighs at 20° C in air of density of 1.2 mg/cm3 against a standared density of 8.0 g/cm3.
1 A reported value without all required parameters cannot be used in any link of traceability. 
Procedure Used:
Modified Substitution using NIST SOP 8, RLWS Work Instruction W105-0023

RLWS Traceable Mass Value Certificate

A customer requesting a RLWS Traceable Mass Value Certificate, needs proof of traceability to NIST and actual values and uncertainties. Comparisons must be made between the item being tested and the standard being used. The known standard used for the tolerance test is essential to the traceable document.

Prior to comparison between the known standard and the item submitted for testing, the known standard must be sufficiently tested over time to produce predictable measurements.

This certificate should contain all of the data related to the test. After testing, a RLWS Traceable Mass Value Certificate is issued. Although the RLWS Traceable Mass Value Certificate provides traceability to NIST, it is not a NVLAP accredited document. If an accredited document is required, please refer to the TMAP Traceable Certificate and/or TMAP Calibration Certificate.

1
Name and address of the calibration laboratory
2
Contractor name and address
3
Client name and address
4
Environmental condition at time of test
5
Your Traceable Certificate number
6
NIST Certificate number
 
Procedure used:
7
Mass Dissemination
8
Identification of the calibrated item and serial number, if applicable
9
Nominal mass value
10
As found condition of the weight before adjustment
11
As left condition of the weight
12
A statement of the estimated value of uncertainty1
13
Tolerance for the specific class
14
Record of the weighing equipment
15
Calibration and due date of RLWS standards. This represents the date that RLWS standard is due for recalibration. This RLWS standard was used to check the performance of your weight. This date in no way reflects an expiration date of the certificate, nor does it infer or specify a recall date. The expiration of the certificate and the specification of a recall date are user assigned responsibilities under NIST H150-1.
16
Assumed density of the weight being tested
17
Date Calibrated
18
Recall Date
19
The NVLAP official logo will be displayed when the documentation meets the scope of accreditation under Lab Code 105001
20
Conventional Mass - mass that weight weighs at 20° C in air of density of 1.2 mg/cm3 against a standared density of 8.0 g/cm3.
1 A reported value without all required parameters cannot be used in any link of traceability. 
Procedure Used:
Modified Substitution using NIST SOP 8, RLWS Work Instruction W105-0023

Statement of Accuracy*

A customer requesting a Statement of Accuracy, needs proof that the nominal values represented by the mass in question have been designed and manufactured to within exact specifications.

The Statement of Accuracy provides just such a document when and where traceability to NIST, and/or the need for a NVLAP accredited document is not a concern. The Statement of Accuracy is the lowest level of documentation offered by Rice Lake Weighing Systems. Check with your internal procedures and policies to determine what type of documentation you require and thoroughly review the RLWS Traceable Mass Value Certificate, Traceable Certificate, and Calibration Certificate options prior to selecting this laboratory documentation.

1
Name and address of` the company that adjusted the weights
2
Part number
3
Description/Serial number
4
Tolerance for the specific class
5
Name and address of company that items were sold to
6
Name and address of company that items are shipped to
*Only applicable to new weights. Not a Legal for Trade or traceable document.

To be the best by every measure®

Top