Product Description
When an auditor asks how you know your balance reads true, an individual ASTM calibration weight with the right certificate is the quickest answer. This group of OHAUS ASTM individual calibration weights covers nominal values from 3 mg to 30 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 30391302: ASTM Class 4 Calibration Weight, 30 mg, One-Piece Flat, with Accredited Calibration Certificate. Weights are manufactured in the USA to the tolerances of ASTM E617, using non-magnetic stainless steel and, for the smallest milligram values, aluminum 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. Add it to your LIGHT LABS order and keep your lab running with genuine OHAUS equipment.
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 | 30391302 |
| Brand | OHAUS |
| Description | ASTM Class 4 Calibration Weight, 30 mg, One-Piece Flat, with Accredited Calibration Certificate |
| Calibration Certificate | ISO/IEC 17025 Accredited Certificate |
| ASTM Class | 4 |
| Weight Value | 30 mg |
| Design | Flat |
| Protective Case | Included |
| Uncertainty | 0.01 mg |
| Construction | One-piece |
| Density at 20°C | 7.95 g/cm3 |
| Dimensions | 0.21 in x 0.11 in x 0.15 in (0.53 cm x 0.279 cm x 0.38 cm) (LxHxW) |
| Dimensions in Case | 2.5 in x 2 in (6.35 cm x 5.08 cm) (HxØ) |
| Weight Material | 304 Stainless Steel |
| Weight Tolerance | 0.075 mg |
| Wgt Origin (USA) | USA |
| Standard | ASTM E617 |
| ASTM Classes in This Group | 1 and 4 |
| Nominal Values in This Group | 3 mg to 30 kg |
| Certificate Options | No Certificate; Non-Accredited (Traceable); ISO/IEC 17025 Accredited |
| Country of Origin | USA |
Related Models
- 30391531 – ASTM Class 1 Calibration Weight, 3 kg, Two-Piece EB Cylindrical, with Accredited Calibration Certificate
- 30391452 – ASTM Class 1 Calibration Weight, 3 kg, Two-Piece Knob Style, with Accredited Calibration Certificate
- 30391601 – ASTM Class 1 Calibration Weight, 3 kg, Two-Piece Knob Style, with Non-Accredited Calibration Certificate
- 30391509 – ASTM Class 1 Calibration Weight, 3 kg, Two-Piece EB Cylindrical, with Non-Accredited Calibration Certificate
- 30391128 – ASTM Class 4 Calibration Weight, 3 kg, Two-Piece EB Cylindrical, No Certificate
- 30391289 – ASTM Class 4 Calibration Weight, 3 kg, Two-Piece Knob Style, No Certificate
- 30391183 – ASTM Class 4 Calibration Weight, 3 kg, Two-Piece EB Cylindrical, with Accredited Calibration Certificate
- 30391322 – ASTM Class 4 Calibration Weight, 3 kg, Two-Piece Knob Style, with Accredited Calibration Certificate
- 30391159 – ASTM Class 4 Calibration Weight, 3 kg, Two-Piece EB Cylindrical, with Non-Accredited Calibration Certificate
- 30391102 – ASTM Class 4 Calibration Weight, 3 kg, Two-Piece Knob Style, with Non-Accredited Calibration Certificate
- 30391395 – ASTM Class 1 Calibration Weight, 3 mg, One-Piece Flat, No Certificate
- 30391428 – ASTM Class 1 Calibration Weight, 3 mg, One-Piece Flat, with Accredited Calibration Certificate
- 30391577 – ASTM Class 1 Calibration Weight, 3 mg, One-Piece Flat, with Non-Accredited Calibration Certificate
- 30391265 – ASTM Class 4 Calibration Weight, 3 mg, One-Piece Flat, No 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
