 
                                   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
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Filtered Search Results
 
                            
                                                                            Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 1
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    Low magnetic permeability and high corrosion resistance for reliable stable values
 
                                                                                    
                                                                                        
                                                                                    
                                                                            
                                                                        | Classification | ASTM Class 1 | 
|---|---|
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Density | 7.9kg/dm3 at 20°C | 
| Product Type | Calibration Weight | 
|---|---|
| Classification | ASTM Class 1 | 
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Includes | Plastic box; Without certificate | 
|---|---|
| Shape | Cylindrical | 
| Product Type | Adjustable Cavity Weight with Knob | 
| Classification | OIML Class F2 | 
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Certifications/Compliance | ISO17025:2005, ISO9001, ISO14001 environmental standard | 
| Density | 7.9kg/dm3 at 20°C | 
| Classification | OIML Class F1 | 
|---|---|
| Material | Stainless Steel | 
| Certifications/Compliance | ISO17025:2005, ISO9001, ISO14001 environmental standard | 
| Density | 7.9kg/dm3 at 20°C | 
                                                                            Sartorius ASTM Class Weight Set
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    ASTM Class Weight Set features calibration weights which can be used with all balance manufacturers' makes and models. Everything you need in one convenient case.
| Product Type | Calibration Mass | 
|---|---|
| Material | Stainless Steel | 
                                                                            Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 4
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    Low magnetic permeability and high corrosion resistance for reliable stable values
| Classification | ASTM Class 4 | 
|---|---|
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Density | 7.9kg/dm3 at 20°C | 
                                                                            Mettler Toledo™ Analytical Individual Weights: ASTM Class 2, with Certificate
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    Low magnetic permeability and high corrosion resistance for reliable stable values
| Includes | Plastic box | 
|---|---|
| Classification | ASTM Class 2 | 
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Certifications/Compliance | With certificate, ISO17025:2005, ISO9001, ISO14001 environmental standard | 
| Density | 7.9kg/dm3 at 20°C | 
                                                                            Troemner™ Individual Analytical Precision Weights, Class 2 with Traceable Certificate
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    Designed for your most demanding weighing applications
| Includes | Polycarbonate case | 
|---|---|
| Classification | ASTM Class 2 | 
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Certifications/Compliance | Traceable certificate, ISO9001 | 
                                                                            Troemner™ Alloy 8 Metric Precision Weight Sets, Class 1 with Traceable Certificate
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                                
                                                                                 
                                                                                    
                                                                                        
                                                                                    
                                                                                
                                                                        
                                                                    
                                        
                                                                    
                                                                     
                                                                                    
                                                                                        
                                                                                    
                                                                                
                                                                        Low magnetic susceptibility, uniform consistency and high resistance to corrosion
| Classification | ASTM Class 1 | 
|---|---|
| Certifications/Compliance | Traceable certificate, ISO9001 | 
                                                                            Mettler Toledo™ E2 Premium Weight Sets with Certificate
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    Made of vacuum melted steel for highest material purity
| Product Type | Weight Set | 
|---|---|
| Classification | OIML Class E2 | 
| Material | Stainless Steel | 
| Certifications/Compliance | With certificate, ISO17025, ISO9001, ISO14001 environmental standard | 
| Density | 8kg/dm3 at 20°C | 
                                                                            Mettler Toledo™ F2AC Basic Weight Sets
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    Made of vacuum melted steel for highest material purity
| Product Type | Adjustable Cavity Weight | 
|---|---|
| Classification | OIML Class F2 | 
| Material | Stainless Steel | 
| Density | 7.9kg/dm3 at 20°C | 
                                                                            Mettler Toledo™ Analytical Weight Sets: ASTM™ Class 1
                                                                    
                                                                    
                                                                    
                                                                        
                                                                    
                                                                        
                                                                    
                                        
                                                                    
                                                                    ASTM precision weights, Best Price-Performance Ratio. Low magnetic permeability and high corrosion resistance ensure reliable values. All weights are made with stainless steel.
| Product Type | Analytical Weight | 
|---|---|
| Classification | ASTM Class 1 | 
| Material | Stainless Steel | 
| Density | 7.9kg/dm3 at 20°C | 
| Includes | Plastic box | 
|---|---|
| Shape | Cylindrical | 
| Product Type | Adjustable Cavity Weight with Knob | 
| Classification | OIML Class F2 | 
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Density | 7.9kg/dm3 at 20°C | 
| Shape | Cylindrical | 
|---|---|
| Product Type | Weight with Knob, One Piece (Monobloc) | 
| Classification | OIML Class E2 | 
| Packaging Quantity | 1 | 
| Quantity | Each | 
| Material | Stainless Steel | 
| Certifications/Compliance | ISO17025, ISO9001, ISO14001 environmental standard | 
| Density | 8kg/dm3 at 20°C | 
 
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                    