The W1000-100 is a 100 gram OIML F1 grade calibration weight for high-precision laboratory balance calibration — typical for analytical balances at 0.1 mg readability and below. F1 grade is the OIML (International Organization of Legal Metrology) accuracy class appropriate for the calibration of precision and analytical balances used in pharmaceutical, biotech, clinical-research, and research-grade weighing workflows.
Key Specifications
| SKU | W1000-100 |
| Type | Calibration weight — OIML F1 grade |
| Mass | 100 g |
| Accuracy class | F1 (OIML standard) |
| Compatible balance grades | Analytical balances (0.1 mg readability), precision balances (1 mg readability) — standard high-precision lab balances |
| Sister SKUs (same F1 grade) | W1000-200 (200 g, $93), W1000-500 (500 g, $124), W1000-1000 (1000 g, $257) |
| Sister grade SKUs | W1005 family (M1 grade — lower-precision, lower-cost weights for balance check / less-precise calibration) |
| Companion accessory | W1000-TF (Tweezers for individual calibration weights, $42) |
| List price | $77 |
OIML F1 vs M1 Grade — Pick the Right Calibration Class
The Accuris calibration weight family covers two OIML accuracy classes:
| Grade | OIML class | Tolerance (100 g) | Compatible balance grade | Use case |
| F1 (this product family) | High-precision | ±0.5 mg | Analytical (0.1 mg) and precision (1 mg) balances | Routine balance calibration in pharmaceutical, biotech, clinical-research, research labs |
| M1 (W1005 family) | Standard | ±5 mg | Standard / industrial balances (10 mg readability+) | Standard balance check, less-precise calibration, educational/teaching labs |
Pick F1 grade (W1000) when:
- Balance is analytical grade (0.1 mg readability) or precision grade (1 mg readability)
- Workflow requires OIML-compliant calibration for regulated environments (FDA, GLP, ISO 17025)
- Calibration accuracy is critical for downstream analytical results
Pick M1 grade (W1005) when: balance is standard / industrial grade, calibration-accuracy is less critical, or budget-tier procurement is the priority.
W1000 F1 Calibration Weight Family
| SKU | Mass | List price |
| W1000-100 (this product) | 100 g | $77 |
| W1000-200 | 200 g | $93 |
| W1000-500 | 500 g | $124 |
| W1000-1000 | 1000 g (1 kg) | $257 |
Pack-quantity sizing for balance calibration: A complete balance-calibration set typically includes multiple mass values across the balance's full range (e.g., for a 500 g balance: 100 g + 200 g + 500 g weights to verify accuracy across the range). The 100 g weight is the mid-range workhorse for typical 200 g – 500 g balances.
Calibration Workflow
Routine balance calibration cycle (typical 6-12 month interval per ISO 17025 / GLP requirements):
- Bring balance to calibration-stable conditions — level surface, draft-free, temperature-equilibrated
- Initialize balance internal calibration (if balance has internal-calibration feature) or use manual external calibration mode
- Place F1 calibration weight on the balance pan using W1000-TF tweezers (avoid contamination from skin oils / fingerprints)
- Read measurement and compare to nominal weight value (within F1 tolerance per OIML standard)
- Document calibration per institutional QA / GLP / ISO 17025 protocol
- Repeat at multiple mass values across the balance range for full-range calibration
Critical: Use tweezers, not fingers — skin oils and fingerprints on calibration weights compromise weight accuracy and require re-cleaning + re-calibration cycle. The W1000-TF tweezers are workflow-mandatory for proper F1 calibration.
Application Profile
Routine analytical balance calibration — pharmaceutical / biotech / clinical-research lab balance calibration cycles per institutional QA protocol.
Precision balance calibration — analytical chemistry, biochemistry research lab balance calibration.
ISO 17025 / GLP regulated lab calibration — regulated environments where F1 grade weights are workflow-mandatory.
Multi-balance facility calibration program — facilities running multiple analytical / precision balances maintain centralized calibration weight inventory.
Educational laboratory calibration training — graduate-level analytical chemistry programs introducing OIML calibration concepts use F1 weights for hands-on calibration exercises.
Method-development weighing workflows — protocol-development workflows where calibration accuracy is part of the method-validation package.
Ordering & Configuration
Pair with W1000-TF tweezers. Calibration-weight handling requires tweezers — confirm W1000-TF inventory at order if not already in inventory.
Pair with multiple mass values for complete balance calibration range coverage. Most labs procure a calibration-weight set spanning the balance's full mass range (e.g., 100 g + 200 g + 500 g + 1000 g for typical 500 g – 5 kg balance ranges).
Storage. F1 calibration weights are sensitive to handling, contamination, and environmental moisture. Store in calibration-weight case (some weight sets ship with case; confirm at order).
Re-certification. F1 calibration weights themselves require periodic re-certification per OIML standard (typical 1–3 year interval depending on use intensity and institutional requirements). Plan for re-certification cycle as part of the long-term calibration program.
Confirm at quote: balance grade in lab inventory (analytical / precision vs standard — F1 vs M1 selection), full mass-range coverage needed, W1000-TF tweezers inventory, storage / case requirements, and lead time.
Warranty: Per Accuris standard accessory terms — confirm at quote.
Accuris W1000 F1 Grade Calibration Weight family:
- W1000-100 (this product) — 100 g ($77) — mid-range workhorse
- W1000-200 — 200 g ($93)
- W1000-500 — 500 g ($124)
- W1000-1000 — 1000 g / 1 kg ($257)
- W1000-TF — Tweezers for individual calibration weights ($42)
Pick F1 grade weights for analytical / precision balance calibration; sister M1 grade family (W1005) covers standard / industrial balance calibration at lower cost.
