4 oz test weight is ideal for calibrating scales that require a 4 oz calibration weight. Class F NO CERTIFICATE (available at additional cost). This test weight is made from 303 stainless steel and conforms to NIST Handbook 105-1 standards.
Please note if your company has a quality assurance program you will probably need to purchase the OPTIONAL Certificate to meet compliance of regulatory and quality control requirements
. We highly recommend you check with your regulatory compliance officer or ISO Auditor for guidance for your specific quality assurance/quality control requirements or when in doubt just purchase the OPTIONAL NVLAP Calibration Certificate.
Weights are the most frequently used and most important equipment for testing scales and balances. By placing various test weights you can verify a balance meets the process tolerance in-between regular scale calibrations. Care should always be taken when using test weights by never touching the weight with bare hands (grease and dirt can transfer from fingers to weight) and never slide weights across the weighing platform since you can change the conventional mass value.
Traceable Certificate is designed for those laboratories and companies that require traceability, but do not need to meet any stringent regulatory requirements. The Traceable Weight Certificate measurement process is based on a single standard and utilizes one series of comparisons.
Report of Traceability - This report identifies:
Type of construction
NIST test number
Date of applicable primary standard(s)
Secondary set number
Includes technician's signature
Description of the weight(s)
Uncertainty of the measurement tolerance
Information on weighing procedures
Date the primary standards were last tested at NIST and the NIST test number
Date and test number for our working standards.
Statement of compliance to ANSI/NCSL Z540 and ANSI/ISO/IEC 17025
NVLAP Accreditation Logo and laboratory code.
Statement of traceability to the International Prototype Kilogram (IPK) this meets the international requirement for traceability to the International System of Units.
Certificate of Calibration - The Certificate of Calibration includes everything found in a Report of Traceability listed above with the additional information listed below:
Test conditions temperature, barometric pressure, humidity.
Conventional Mass Correction
Uncertainty of the measurement
Identification of the balance used in the calibration
as found value if an adjustment is performed
assumed density of the weight
material weight is made from
Pass/Fail result of magnetic testing
Volume of the weight
Cubical Coefficient of expansion
True Mass correction
Difference between Traceability and Certificate of Calibration?
The major difference between the Report of Traceability and the Calibration Certificate is the Report of Traceability is a tolerance test and is only available for new weights. The Certificate of Calibration is a full report of the parameters tested. Above we outline what comes with each report. The Certificate of Calibration will, however, give a smaller uncertainty and a more precise value of the actual mass due to the multiple measurements that are made during the calibrating process. If you require a accredited laboratory certificate to meet ISO/IEC 17025 & ANSI/NCSC Z540-1 the you need a NVLAP Certificate of Calibration.
We also offer a huge selection of Laboratory Calibration Weights
and Calibration Mass Sets
with Calibration certification and NIST Traceable Calibration for lab balances at www.calibrationweight.com
All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured.