Product Description
Build exactly the test-weight inventory your calibration routine needs, one mass value at a time, instead of paying for a full set you only partly use. This group of OHAUS ASTM individual calibration weights covers nominal values from 300 mg to 4 kg in ASTM Class 1 and 4, so you can match tolerance to the readability of the balance or scale being tested. Each value is offered with no certificate, a non-accredited traceable certificate, or an ISO/IEC 17025 accredited certificate, letting you pay only for the documentation your quality system requires.
This listing is for OHAUS item number 30391415: ASTM Class 1 Calibration Weight, 300 g, Two-Piece Knob Style, No Certificate. Weights are manufactured in the USA to the tolerances of ASTM E617, using non-magnetic stainless steel so that density and magnetic effects stay within class limits. By style, milligram values are one-piece flat weights; gram and kilogram values are two-piece designs with an adjusting cavity, offered as knob-style cylinders or EB-style straight cylinders and grip-handle weights at the heavy end. Handle them with gloves, forceps or a lifting tool, keep them in their storage case between uses, and recalibrate on a fixed interval to maintain traceability. LIGHT LABS ships genuine OHAUS products and can help you match accessories and parts to your instrument.
Key Features
- ASTM E617 Classes 1 and 4 – Choose the tolerance class that fits your balance, from Class 1 reference work to Class 4 routine checks
- Three Certificate Levels – Order with no certificate, a non-accredited traceable certificate, or an ISO/IEC 17025 accredited certificate
- Corrosion-Resistant Stainless Steel – Non-magnetic stainless alloys hold their mass and resist wear in everyday lab use
- Two-Piece Adjustable Construction – Gram and kilogram weights have a sealed adjusting cavity so the mass can be restored during recalibration
- Multiple Body Styles – Knob-style, straight cylindrical, grip-handle and flat milligram forms suit different balance pans and handling needs
- Made in the USA – Weights in this group are produced in the United States
Specifications
| Item Number | 30391415 |
| Brand | OHAUS |
| Description | ASTM Class 1 Calibration Weight, 300 g, Two-Piece Knob Style, No Certificate |
| Calibration Certificate | No Certificate |
| ASTM Class | 1 |
| Weight Value | 300 g |
| Design | Cylindrical with handling knob |
| Protective Case | Included |
| Construction | Two-piece |
| Density at 20°C | 8.03 g/cm3 |
| Dimensions | 2.02 in x 1.42 in (5.128 cm x 3.599 cm) (HxØ) |
| Dimensions in Case | 4.5 in x 3.5 in (11.43 cm x 8.89 cm) (HxØ) |
| Weight Material | Alloy 8;Alloy 8 |
| Weight Tolerance | 0.75 mg |
| Wgt Origin (USA) | USA |
| Standard | ASTM E617 |
| ASTM Classes in This Group | 1 and 4 |
| Nominal Values in This Group | 300 mg to 4 kg |
| Certificate Options | No Certificate; Non-Accredited (Traceable); ISO/IEC 17025 Accredited |
| Country of Origin | USA |
Related Models
- 30391471 – ASTM Class 1 Calibration Weight, 300 g, Two-Piece EB Cylindrical, No Certificate
- 30391528 – ASTM Class 1 Calibration Weight, 300 g, Two-Piece EB Cylindrical, with Accredited Calibration Certificate
- 30391448 – ASTM Class 1 Calibration Weight, 300 g, Two-Piece Knob Style, with Accredited Calibration Certificate
- 30391597 – ASTM Class 1 Calibration Weight, 300 g, Two-Piece Knob Style, with Non-Accredited Calibration Certificate
- 30391502 – ASTM Class 1 Calibration Weight, 300 g, Two-Piece EB Cylindrical, with Non-Accredited Calibration Certificate
- 30391285 – ASTM Class 4 Calibration Weight, 300 g, Two-Piece Knob Style, No Certificate
- 80780137 – ASTM Class 4 Calibration Weight, 300 g, Two-Piece EB Cylindrical, No Certificate
- 30391318 – ASTM Class 4 Calibration Weight, 300 g, Two-Piece Knob Style, with Accredited Calibration Certificate
- 80780138 – ASTM Class 4 Calibration Weight, 300 g, Two-Piece EB Cylindrical, with Accredited Calibration Certificate
- 30391152 – ASTM Class 4 Calibration Weight, 300 g, Two-Piece EB Cylindrical, with Non-Accredited Calibration Certificate
- 30391098 – ASTM Class 4 Calibration Weight, 300 g, Two-Piece Knob Style, with Non-Accredited Calibration Certificate
- 30391403 – ASTM Class 1 Calibration Weight, 300 mg, One-Piece Flat, No Certificate
- 30391436 – ASTM Class 1 Calibration Weight, 300 mg, One-Piece Flat, with Accredited Calibration Certificate
- 30391585 – ASTM Class 1 Calibration Weight, 300 mg, One-Piece Flat, with Non-Accredited Calibration Certificate
Applications
- Routine daily and weekly balance performance checks
- Calibration of analytical, precision and top-loading balances
- ISO 9001, GLP and GMP quality-audit documentation
- Repeatability, linearity and eccentricity testing
- Replacing lost or out-of-tolerance weights in an existing kit
- Industrial bench and floor scale verification
