Product Description
Verify an entire balance range in one session with a complete, cased set of ASTM calibration weights from OHAUS. These sets span from the milligram range up to multi-kilogram masses, and each ships with an ISO/IEC 17025 accredited or traceable calibration certificate so your results hold up during audits. Compact Cal-Pak kits bundle just the weights needed for routine checks of analytical and precision balances.
This listing is for OHAUS item number 30391255: ASTM Class 4 Calibration Weight Set, 20 kg to 1 mg, with Accredited Calibration Certificate. Weights 1 g and above use two-piece construction, while fractional-gram weights are one-piece stainless steel or aluminum flats sized for tweezer handling. Each set is offered in ASTM Class 1 for high-precision reference work or ASTM Class 4 for general balance verification, with tolerances defined by ASTM E617. A fitted protective case keeps every piece organized and clean; the largest 25 kg and 50 kg weights in the biggest sets are supplied outside the case. LIGHT LABS ships genuine OHAUS products and can help you match accessories and parts to your instrument.
Key Features
- Complete Ranges – sets cover from 1 mg or 10 mg up to 500 g, 2 kg, 10 kg, 20 kg, 25 kg or 50 kg so one kit checks the whole weighing range
- ASTM E617 Classes – choose Class 1 for reference standards and high-precision balances or Class 4 for routine laboratory and industrial checks
- Certificate Options – ISO/IEC 17025 accredited certificates or traceable non-accredited certificates support quality system and audit requirements
- Cal-Pak Kits – three-piece kits combine a top weight, a tenth-value weight and a small weight for fast span and linearity checks
- Protective Case – fitted cases store each weight in its own pocket to limit handling damage and contamination
- Made in USA – sets are produced in the USA with two-piece construction for 1 g and larger weights
Specifications
| Item Number | 30391255 |
| Brand | OHAUS |
| Description | ASTM Class 4 Calibration Weight Set, 20 kg to 1 mg, with Accredited Calibration Certificate |
| Calibration Certificate | ISO/IEC 17025 Accredited Certificate |
| ASTM Class | 4 |
| Weight Set Range | 20 kg - 1 mg |
| Set Capacity | 40 kg |
| Set Total Pieces | 30 |
| Protective Case | Included |
| Construction | 1 g and above are two-piece; 500 mg and below are one-piece |
| Density at 20°C | Below 5 mg are 2.70 g/cm3;500 mg to 5 mg are 7.95 g/cm3;2 kg and above are 7.95 g/cm3;1 kg to 1 g are 8.03 g/cm3 |
| Dimensions in Case | 11.7 in x 19.7 in x 24.6 in (29.718 cm x 50.038 cm x 62.484 cm) (LxHxW) |
| Set Contents | (2) 2 g;(2) 200 g;(2) 20 mg;20 kg;500 mg;10 g;(2) 20 g;100 g;100 mg;10 mg;(2) 200 mg;10 kg;1 g;50 g;(2) 2 kg;5 g;1 kg;5 mg;500 g;(2) 2 mg;50 mg;1 mg;5 kg |
| Weight Material | 500 mg to 5 mg are 304 Stainless Steel;≥2 kg are 316 Stainless Steel;Below 5 mg are Aluminum;1 kg to 1 g are Alloy 8 |
| Wgt Origin (USA) | USA |
| Standard | ASTM E617 |
| ASTM Classes Offered | Class 1, Class 4 |
| Certificate Options | ISO/IEC 17025 Accredited or Traceable (Non-Accredited) |
| Origin | USA |
Related Models
- 30391245 – ASTM Class 4 Calibration Weight Set, 500 g to 1 mg, with Accredited Calibration Certificate
- 30390055 – ASTM Class 1 Calibration Weight Set, (2) 2 kg to 1 mg, with Accredited Calibration Certificate
- 30390059 – ASTM Class 1 Calibration Weight Set, (2) 2 kg to 1 mg, with Non-Accredited Calibration Certificate
- 30390051 – ASTM Class 4 Calibration Weight Set, (2) 2 kg to 1 mg, with Accredited Calibration Certificate
- 30390043 – ASTM Class 4 Calibration Weight Set, (2) 2 kg to 1 mg, with Non-Accredited Calibration Certificate
- 30391383 – ASTM Class 1 Calibration Weight Set, 10 kg to 1 mg, with Accredited Calibration Certificate
- 30391253 – ASTM Class 4 Calibration Weight Set, 10 kg to 1 mg, with Accredited Calibration Certificate
- 30391794 – ASTM Class 1 Cal-Pak Calibration Weight Set, 100 g to 20 mg, with Accredited Calibration Certificate
- 30391793 – ASTM Class 1 Cal-Pak Calibration Weight Set, 100 g to 200 mg, with Accredited Calibration Certificate
- 30391796 – ASTM Class 1 Cal-Pak Calibration Weight Set, 20 g to 200 mg, with Accredited Calibration Certificate
- 30391791 – ASTM Class 1 Cal-Pak Calibration Weight Set, 200 g to 200 mg, with Accredited Calibration Certificate
- 30391789 – ASTM Class 1 Cal-Pak Calibration Weight Set, 500 g to 20 mg, with Accredited Calibration Certificate
- 30391788 – ASTM Class 1 Cal-Pak Calibration Weight Set, 500 g to 200 mg, with Accredited Calibration Certificate
- 30391385 – ASTM Class 1 Calibration Weight Set, 20 kg to 1 mg, with Accredited Calibration Certificate
Applications
- Routine calibration of analytical and precision balances
- Linearity and repeatability testing of laboratory scales
- In-house mass standard programs and ISO 9001 audits
- Pharmaceutical and GLP/GMP balance qualification
- Service technician field calibration kits
- Reference standards for calibrating lower-class weights
