Calibration Weights
Accurate and stable reference standards for calibrating weighing equipment, including variously certified/accredited weights and weight sets from different classes. Products may be constructed of aluminum, stainless steel, brass, iron, and other alloys.
Calibration weights (also known as reference weights or test weights) are manufactured to meet high tolerances and accuracy. They are used to spot-check the performance and verify the calibration of analytical balances, precision balances, and general-purpose scales in research laboratories, educational settings, and other working environments. Some calibration weights may also be used as reference weights for the calibration of improvised or non-certified weights.
How Are Calibration Weights Made?
Calibration weights may be take the form of simple discs, cylinders, wires, or leaves. Sold separately or as sets, they may also be supplied with tweezers, gloves, and a protective case. Calibration weights are often supplied as accessories for specific balance brands and models.
Calibration weights are made from polished brass, aluminum, special stainless steels, or other metals for durability, anti-magnetization, and resistance to corrosion or wear that may affect their accuracy.
Available in nominal values from a few milligrams to 10 kg or more, they may be supplied with certificates or statements of accuracy, compliance, and traceability.
How Are Calibration Weights Classified?
Calibration weights are classified based on accuracy by organizations such as ASTM, OIML, and NIST. The appropriate classification depends on the resolution of the balance and the degree of accuracy needed to satisfy a particular weighing application.
Principal Classes of Calibration Weights:
• Class M1: For standard scales
• Class F1: For precision electronic balances
• Class E2: For highly accurate analytical balances
AVANTOR MASTERFLEX (VWR LLC) PIPE ADAPT M1/2FTFTX1/4FTFT 10
Masterflex Fitting, Polypropylene, Straight, Hosebarb to Thread, 1/4IN ID x 1/2IN NPT(M)10/PK, Avantor
Uline Stainless Steel Weight With Nist Traceable Certificate - Class 5, 5 Kg
Stainless Steel Weight With Nist Traceable Certificate-Class 5 5 Kg
Uline Cast Iron Weight With Nist Traceable Certificate - Class 6, 50 Lb
Cast Iron Weight With Nist Traceable Certificate-Class 6 50 Lb
Antrin Miniature Specialties Inc 000-120 X 1/16 SLOTTED BINDING
NC3312597 000-120 X 1/16 SLOTTED BINDING
Immunology Consultants CSFV E2 Protein - Recombinant
This recombinant Classical Swine Fever Virus (CSFV) E2 antigen is a high‑quality research reagent designed to support virology, immunology, and diagnostic assay development. The E2 glycoprotein is the major immunodominant structural protein of CSFV and plays a central role in generating neutralizing antibodies, making it essential for studies of viral immunity and vaccine response. Produced recombinantly and supplied at 0.1 mg, this purified protein provides consistent performance in ELISA, serological assay calibration, antigen detection workflows, and method development for IVD applications. Its defined composition and reliable lot‑to‑lot reproducibility enable accurate assay optimization and experimental standardization. Manufactured by Immunology Consultants, this CSFV E2 antigen is ideal for laboratories requiring a dependable, well‑characterized viral protein for research and diagnostic innovation.
Bio X Cell InVivoMAb anti-CD11b, M1/70, rat IgG2b, 50 MG
The M1/70 monoclonal antibody reacts with mouse and human CD11b, a 170 kDa membrane glycoprotein also known as integrin alpha M (ITGAM). CD11b belongs to the integrin alpha family and is primarily expressed on granulocytes and monocytes/macrophages but also expressed on dendritic cells, NK cells, and subsets of T and B cells. CD11b and CD18 combine to form Mac-1. Mac-1 functions as a complement receptor as well as a receptor for fibrinogen, factor X, and ICAM1.
- In vivo CD11b neutralization
- ILC2 cell purification
- Flow cytometry
- Purity: ≥95%, determined by SDS-PAGE
- Endotoxin: ≤1EU/mg (≤0.001EU/μg)
- Formulation: PBS, pH 7.0, contains no stabilizers or preservatives
- Purification: Protein G
- Sterility: 0.2 μm filtered
Sigma Aldrich Fine Chemicals Biosciences AccurisTM f1 Grade Calibra1EA
Precision compact and portable balances (readability 0.1 to 0.001g) can be calibrated with our Basic Class f1 Calibration Set. Included in the set are 23 stainless steel cylindrical and leaf weights 2 x 200g 1 x 100g 1 x 50g 2 x 20g 1 x 10g 1 x 5g 2 x 2g 1 x 1g 1 x 500mg 2 x 200mg 1 x 100mg 1 x 50mg 2 x 20mg 1 x 10mg 1 x 5mg 2 x 2mg 1 x 1mg. Cylindrical weights are marked with their nominal value. All are supplied in a protective case along with tweezers a cleaning cloth and dust brush.
Cayman Chemical 8-iso Prostaglandin E2 isopropyl ester, Purity: ≥98%, CAS: 330589-21-4, 1 mg
8-iso PGE2 isopropyl ester is a more lipophilic form of the free acid, 8-iso PGE2. Prostaglandin esters have enhanced lipid solubility compared to their parent compounds. They are generally hydrolyzed to the free acid upon in vivo administration, making the esters useful prodrugs. In general, the C-1 esters of prostaglandins show greatly diminished agonist activity in vitro compared to the parent free acids.