Product Description
Replace just the denomination you need instead of buying a whole set: these OHAUS UltraClass individual weights cover values from milligram wafers to 30 kg grip-handle masses. They suit metrology labs, QA departments and calibration providers that keep a precise reference on hand for daily, weekly or audit checks.
This listing is for OHAUS item number 30390194: UltraClass ASTM Reference Weight, 300 g, Two-Piece Cylindrical, No Certificate. Heavier masses are two-piece stainless steel cylinders or grip-handle weights, while milligram values are flat one-piece wafers in stainless steel or aluminum with a turned-up edge for handling. Each weight carries a tight tolerance listed per value, and most ship in a protective case. Certificate options range from none to traceable or ISO/IEC 17025 accredited, the latter listing measurement uncertainty. Order it from LIGHT LABS alongside the rest of your OHAUS balances, weights and lab equipment.
Key Features
- Primary-Reference Accuracy – UltraClass tolerances suit calibrating ASTM Class 1 and lower weights and balances that read to 0.01 mg
- Value-Matched Design – Two-piece cylinders from 1 g up, flat one-piece wafers at 500 mg and below for tweezer handling
- Certificate Choice – Order with no certificate, a traceable certificate, or an ISO/IEC 17025 accredited certificate with uncertainty
- Corrosion-Resistant Materials – Alloy 8, 303, 304 or 316 stainless steel, with aluminum for some milligram values
- Grip-Handle Options – EB grip-handle versions of heavy kilogram values allow safer lifting and placement
- Protective Storage – Most values ship in a protective case to limit handling damage and contamination
Specifications
| Item Number | 30390194 |
| Brand | OHAUS |
| Description | UltraClass ASTM Reference Weight, 300 g, Two-Piece Cylindrical, No Certificate |
| Calibration Certificate | No Certificate |
| ASTM Class | UltraClass |
| Weight Value | 300 g |
| Design | Cylindrical |
| 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 | 0.38 mg |
| Wgt Origin (USA) | USA |
| Weight Grade | UltraClass |
| Certificate Options | None, Traceable, ISO/IEC 17025 Accredited |
| Country of Origin | USA |
Related Models
- 30390181 – UltraClass ASTM Reference Weight, 200 mg, One-Piece Flat, No Certificate
- 30390246 – UltraClass ASTM Reference Weight, 200 mg, One-Piece Flat, with Accredited Calibration Certificate
- 30390213 – UltraClass ASTM Reference Weight, 200 mg, One-Piece Flat, with Non-Accredited Calibration Certificate
- 30390361 – UltraClass EB Grip Handle Reference Weight, 24 kg, Two-Piece, with Accredited Calibration Certificate
- 30390330 – UltraClass EB Grip Handle Reference Weight, 24 kg, Two-Piece, with Non-Accredited Calibration Certificate
- 30390202 – UltraClass ASTM Reference Weight, 25 kg, Two-Piece Cylindrical, No Certificate
- 30390362 – UltraClass EB Grip Handle Reference Weight, 25 kg, Two-Piece, with Accredited Calibration Certificate
- 30390267 – UltraClass ASTM Reference Weight, 25 kg, Two-Piece Cylindrical, with Accredited Calibration Certificate
- 30390331 – UltraClass EB Grip Handle Reference Weight, 25 kg, Two-Piece, with Non-Accredited Calibration Certificate
- 30390234 – UltraClass ASTM Reference Weight, 25 kg, Two-Piece Cylindrical, with Non-Accredited Calibration Certificate
- 30390186 – UltraClass ASTM Reference Weight, 3 g, Two-Piece Cylindrical, No Certificate
- 30390251 – UltraClass ASTM Reference Weight, 3 g, Two-Piece Cylindrical, with Accredited Calibration Certificate
- 30390218 – UltraClass ASTM Reference Weight, 3 g, Two-Piece Cylindrical, with Non-Accredited Calibration Certificate
- 30390198 – UltraClass ASTM Reference Weight, 3 kg, Two-Piece Cylindrical, No Certificate
Applications
- Calibration of analytical and semi-micro balances
- Primary reference for ASTM Class 1 working weights
- Metrology and calibration laboratories
- ISO/IEC 17025 and GLP quality programs
- Routine balance performance checks
- Mass comparison and traceability chains
