Product Description
When a quality audit asks how your balances are verified, a single high-grade reference weight gives you a clean, defensible answer. OHAUS UltraClass individual calibration weights are built for primary-reference duty, suitable for checking high-precision balances with readability down to 0.01 mg.
This listing is for OHAUS item number 30390242: UltraClass ASTM Reference Weight, 20 mg, One-Piece Flat, with Accredited Calibration Certificate. Gram and kilogram values are two-piece cylinders, the EB grip-handle versions add a handle for safe lifting of heavy masses, and milligram values are one-piece flat wafers. Materials include Alloy 8 stainless steel and 303, 304 or 316 stainless steel, chosen for density and corrosion resistance. Every value is offered with no certificate, a traceable certificate, or an ISO/IEC 17025 accredited certificate. Add it to your LIGHT LABS order and keep your lab running with genuine OHAUS 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 | 30390242 |
| Brand | OHAUS |
| Description | UltraClass ASTM Reference Weight, 20 mg, One-Piece Flat, with Accredited Calibration Certificate |
| Weight Value | 20 mg |
| Weight Grade | UltraClass |
| Style | ASTM |
| Construction | One-Piece |
| Certificate | ISO/IEC 17025 Accredited Certificate |
| Material | 304 Stainless Steel |
| Certificate Options | None, Traceable, ISO/IEC 17025 Accredited |
| Country of Origin | USA |
Related Models
- 30390319 – UltraClass EB Cylindrical Reference Weight, 1,500 g, Two-Piece, with Non-Accredited Calibration Certificate
- 30390297 – UltraClass EB Grip Handle Reference Weight, 16 kg, Two-Piece, No Certificate
- 30390359 – UltraClass EB Grip Handle Reference Weight, 16 kg, Two-Piece, with Accredited Calibration Certificate
- 30390328 – UltraClass EB Grip Handle Reference Weight, 16 kg, Two-Piece, with Non-Accredited Calibration Certificate
- 30390281 – UltraClass EB Cylindrical Reference Weight, 160 g, Two-Piece, No Certificate
- 30390343 – UltraClass EB Cylindrical Reference Weight, 160 g, Two-Piece, with Accredited Calibration Certificate
- 30390312 – UltraClass EB Cylindrical Reference Weight, 160 g, Two-Piece, with Non-Accredited Calibration Certificate
- 30390185 – UltraClass ASTM Reference Weight, 2 g, Two-Piece Cylindrical, No Certificate
- 30390250 – UltraClass ASTM Reference Weight, 2 g, Two-Piece Cylindrical, with Accredited Calibration Certificate
- 30390217 – UltraClass ASTM Reference Weight, 2 g, Two-Piece Cylindrical, with Non-Accredited Calibration Certificate
- 30390197 – UltraClass ASTM Reference Weight, 2 kg, Two-Piece Cylindrical, No Certificate
- 30390289 – UltraClass EB Cylindrical Reference Weight, 2 kg, Two-Piece, No Certificate
- 30390351 – UltraClass EB Cylindrical Reference Weight, 2 kg, Two-Piece, with Accredited Calibration Certificate
- 30390262 – UltraClass ASTM Reference Weight, 2 kg, Two-Piece Cylindrical, with Accredited Calibration 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
