4 kilogram Class 2 Calibration Weight
with ± 25 mg tolerance (CERTIFICATES available at additional cost). This highly polished 303 stainless steel weight is a two (2) piece construction with a groove near the top for easier handling.
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. Routine testing for weighing devices like balances and scales is critical to ensuring accurate weighing results and maintaining quality control standards. 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 Certificate measurement process is based on a single standard and utilizes one series of comparisons. If you are required to meet standards including NVLAP Handbook 150-2, ISO/IEC 9000, ISO/IEC 17025, FDA, GMP, GLP, DOD, ANSI/NCSL Z540-1, and nuclear requirement a Traceable Certificate will NOT meet the compliance requirements.
We always recommend you check with your regulatory or compliance officer to verify what quality or regulatory requirements must be meet before ordering any calibration weights. We always like to say when in doubt purchase weights with the NVLAP Certificate.
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.
To get all the accuracy your electronic balance or digital scale
provides, you need to perform routine calibrations and verifications using precision calibration weights. Troemner's Stainless Steel Electronic Balance Calibration Weights are intended for this purpose. ASTM stainless steel electronic balance calibration weights possessing closely controlled density, low magnetic susceptibility, good stability and resistance to corrosion and damage through handling. All of Troemner's Electronic Balance Calibration Weights are type II which have an adjusting cavity to allow for adjustment during future calibrations. Within the weight there is a cavity that is filled with adjusting material, typically the same material from which the weight is made. This cavity is sealed during the production process to ensure the stability of the weight. Electronic Balance Calibration Weights are cylindrical in shape and flat on top, to stack easily on center.
Construction and General Shape:
Troemner's Electronic Balance Calibration Weights are manufactured from the highest quality stainless steel alloy, possessing closely controlled density, low magnetic susceptibility, good stability and resistance to corrosion and damage through handling. All of Troemner's Electronic Balance Calibration Weights are type II which have an adjusting cavity to allow for adjustment during future calibrations. Within the weight there is a cavity that is filled with adjusting material, typically the same material from which the weight is made. This cavity is sealed during the production process to ensure the stability of the weight. Electronic Balance Calibration Weights are cylindrical in shape and flat on top, to stack easily on center.
- Grip handle weights
from 5 kg to 30 kg have a recess in the top center of the weight with a lifting handle spanning the recess slightly below the top surface of the weight. The recess allows the user to pick up the weight using the handle and provides clearance for the user's hand. Grip handle weights 5 kg to 10 kg are 5 inches in diameter. Grip handle weights above 10 kg to 30 kg are 6 inches in diameter. The adjusting cavity for grip handle weights is within the lifting handle.
- Cylindrical weights
from 1 kg to 5 kg are machined as cylinders and have a groove around the diameter approximately 25% from the top of the weight to allow for easier handling. The adjusting cavity opening is in the bottom of the weight for the 1 kg weight and on the top of the weight for the 2 kg through 5 kg.
- Weights from 200 g to 500 g are machined as straight cylinders
with the adjusting cavity opening in the bottom of the weight.
Troemner ANSI/ASTM Classes 1
have all surfaces polished to a perfect, mirror like finish.
Polycarbonate Cases for Individual Weights:
To safeguard your Electronic Balance Weights, attractive, durable, high quality, polycarbonate cases are provided with weights 10 g through 5 kg. The polycarbonate cases feature a custom insert, bumper, and locking lid to assure weights are held securely within the case and avoid movement. Polycarbonate cases for 10 kg weights are available at an additional cost.
Selecting The Right Weight:
- Check you scale's manual or specification sheet to find the weight value required to calibrate your scale.
- It is recommended that the weight selected to calibrate a balance and/or scale have a tolerance small enough as not to be detected by the balance and/or scale. Troemner recommends the tolerance of a weight selected for calibrating a balance and/or scale is no more than 1/3 of the readability or precision of the balance and/or scale being calibrated. If this cannot be achieved, it is suggested that a Class 1 Electronic Balance Calibration Weight with a NVLAP certificate be ordered which provides the actual mass value for the weight which reduces measurement uncertainty.
- Electronic Balance Calibration Weights can also be used to check or verify the accuracy of your balance and/or scale between calibrations. It is recommended that the user check a balance and/or scale prior to each use. Keeping the weight at or near the balance and/or scale keeps the weight at the same temperature as the equipment.
Product photo may not exactly match the product offered for sale.
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 and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.