The Ohaus metric, stainless steel calibration weight meets
International Organization of Legal Metrology (OIML) Class F1
specifications and designed for calibrating other weights, or
electronic balances and scales. The weight is constructed of
stainless steel for stability, resistance to corrosion, and low
magnetic susceptibility. The weight meets OIML R111 Class F1
specifications for use calibrating high-precision top loading
balances with a readability as low as 0.01g to 0.001g.
The National Voluntary Laboratory Accreditation Program (NVLAP)
accredits laboratories for compliance with ISO/IEC 17025 on the
basis of their ability to meet the technical requirements set
forth in NIST Handbook 150-2, and can provide accreditation to
ANSI/NCSL Z540-1-1994. NVLAP calibrations and certifications meet
all ISO, , GMP, GLP, DOD, ANSI/NCSL Z540-1 and Nuclear
requirements and are traceable to NIST. Procedures and processes
used to generate this multi-page certificate, as well as its
format and content, are prescribed by NVLAP. The document
contains customer name & address, date of calibration, equipment
and standards used in the calibration, accuracy class, true mass
value (mass in a vacuum), “As Found” mass correction (for
recalibration), “As Left” mass correction, uncertainty of
measurement process (uncertainty to tolerance ratios are
guaranteed), environmental conditions during test, construction
and density of the weight, calibration procedure, and a statement
of traceability to NIST. Mutual re arrangements include
The International Laboratory Accreditation Cooperation (ILAC),
The Asia Pacific Laboratory Accreditation Cooperation (AC) and
The National Cooperation for Laboratory Accreditation (NACLA).
Calibration weights are used to measure the weight or mass of an
object using a balance or scale, or to calibrate other weights or
instruments. Calibration weights can be certified or uncertified.
Certified weights meet strict guidelines for accuracy and can
usually be recertified. Certified weights are used in labs where
a high degree of accuracy and repeatability is required.
Uncertified weights are used where a lower degree of accuracy is
required, including student laboratories, rough weighting
operations, and measuring force. Hooked and slotted weights are
often used to measure pressure, torque, and tensile strength, and
to demonstrate basic laws of physics. Calibration weights differ
from lab weights, which are general purpose weights used to hold
an object in place, similar to a paperweight.
Science education products incorporate applied math and science
principles into classroom projects. Teachers in pre-K,
elementary, and secondary classrooms use science education kits
and products alongside science, technology, engineering, and math
(STEM) curriculum to demonstrate STEM concepts and real-world
applications through hands-on activities. Science education
projects include a broad range of activities, such as practical
experiments in engineering, aeronautics, robotics, energy,
chemistry, physics, biology, and geology.
Ohaus manufactures scales and balances for laboratory,
educational, retail, food, and jewelry applications. The company,
founded in 1914, is headquartered in Parsippany, NJ.
- Metric, OIML Class F1 calibration weight for calibrating other weights, or electronic balances and scales.
- Stainless steel construction for stability, resistance to corrosion, and low magnetic susceptibility.
- Meets International Organization of Legal Metrology (OIML) R111 specifications for weights in Class F1 for use calibrating high-precision top loading balances with a readability as low as 0.01g to 0.001g.
- Optional NVLAP certificate ensures precision and traceability.