The W1101-6-100 is the Class E2 OIML calibration weight set — the highest-precision OIML calibration grade in the Accuris catalog (above F1 grade). The 6-piece set covers 100 mg to 100 g range for calibration of semi-micro analytical balances (where 0.1 mg / 0.01 mg readability requires tighter-than-F1 tolerance) and regulated-laboratory analytical balance calibration at the highest accuracy class.
Key Specifications
| SKU | W1101-6-100 |
| Type | Class E2 calibration weight set, 6 pieces |
| Mass range | 100 mg to 100 g (6 individual pieces) |
| Accuracy class | E2 (OIML standard — highest precision in the Accuris catalog) |
| Compatible balance grades | Semi-micro analytical balances (0.01 mg readability — e.g., the W3002A-120 semi-micro Tx Touch Screen balance), regulated-lab analytical balances at 0.1 mg readability requiring tighter-than-F1 tolerance |
| Companion accessory | W1000-TF Tweezers ($42 — workflow-mandatory; E2 weights are even more skin-contamination-sensitive than F1) |
| List price | $751 |
OIML Calibration Grade Hierarchy — E2 vs F1 vs M1
The OIML weight-class hierarchy (most precise → least precise):
| Grade | OIML class | Tolerance (100 g) | Compatible balance | Per-set cost |
| E2 (this product) | Highest-precision | ±0.15 mg | Semi-micro / regulated analytical | $751 (6 pieces) |
| F1 (W1100-200) | High-precision | ±0.5 mg | Standard analytical / precision | $618 (23 pieces) |
| M1 (W1005-x family) | Standard | ±5 mg | Standard / industrial | $16-$209 per piece |
Pick E2 grade (W1101-6-100) when:
- Balance is semi-micro analytical (0.01 mg readability — e.g., the W3002A-120 Tx Touch Screen semi-micro)
- Workflow is in a highly-regulated environment (FDA, GLP, ISO 17025) requiring documented E2-grade calibration traceability
- Calibration accuracy at the F1 tolerance (±0.5 mg at 100 g) is insufficient for the workflow's analytical requirements
Pick F1 grade (W1100-200) when: standard analytical balance calibration (0.1 mg readability) is sufficient — most common analytical balance calibration scope.
Pick M1 grade (W1005-x family) for standard / industrial balance calibration.
Why a 6-Piece Set vs Larger F1 Set
The W1101 E2 set is smaller than the W1100-200 F1 set (23 pieces) because E2 grade weights carry higher per-weight cost — the 6-piece composition provides multi-point calibration coverage at strategically-selected mass values (typical: 100 mg, 1 g, 10 g, 100 g — multi-decade coverage with duplicate values for verification) rather than every-mass-value coverage:
| Set composition pattern (typical) | Use case |
| 100 mg, 200 mg | Sub-gram E2 verification |
| 1 g, 2 g | Low-mass E2 verification |
| 10 g, 100 g | Mid / high-mass E2 verification |
For complete sub-milligram coverage, the F1 set (W1100-200, 23 pieces, 1 mg-200 g) is the better choice; for E2-precision at strategic mass points, the W1101-6-100 is the right pick.
Pairing with Accuris Semi-Micro / Analytical Balances
| Balance SKU | Capacity / Readability | Calibration coverage |
| W3002A-120 (semi-micro Tx) | 62 g × 0.0001 g / 120 g × 0.00001 g (semi-micro) | W1101-6-100 (E2 grade) — workflow-mandatory for semi-micro tolerance |
| W3101A-120 / -220 (Dx Graphical) | 120 g / 220 g × 0.0001 g | W1101-6-100 (E2) preferred for regulated labs; W1100-200 (F1) acceptable for standard scope |
| W3102A-220 (Tx Touch Screen) | 220 g × 0.0001 g | W1101-6-100 (E2) preferred for regulated labs; W1100-200 (F1) acceptable |
| W3100 / W3100A series | 120 g / 210 g × 0.0001 g | W1100-200 (F1) — F1 grade sufficient for these standard analytical balances |
Application Profile
Semi-micro analytical balance calibration — the workhorse application. Calibration of the W3002A-120 semi-micro Tx balance and other semi-micro instruments at 0.01 mg readability where F1 tolerance is insufficient.
Regulated-laboratory calibration programs — FDA, GLP, ISO 17025 regulated environments requiring documented E2-grade traceability.
Pharmaceutical / biotech analytical labs — high-stakes weighing workflows where calibration accuracy directly impacts release-criteria decisions.
Method-development analytical workflows — protocol-development workflows requiring tightest-tolerance calibration during method-validation packages.
Multi-balance facility procurement — facilities running multiple semi-micro / regulated analytical balances benefit from centralized E2 set procurement.
Ordering & Configuration
Pair with W1000-TF tweezers. E2 weights are the most skin-contamination-sensitive weights in the catalog — tweezer handling is critical.
Confirm case / storage. E2 sets ship in protective case with weight-position cutouts and typically include integrated calibration certificate. Confirm case + certificate inclusion at order.
Re-certification cycle. E2 weights require periodic re-certification per OIML standard (typical 1–3 year interval; some regulated environments require annual re-certification). Plan for re-certification cycle.
Confirm at quote: balance grade in lab inventory (semi-micro or regulated analytical), full mass-range coverage need (E2 set vs broader F1 set), case / certificate inclusion, re-certification program plan, and lead time.
Warranty: Per Accuris standard accessory terms — confirm at quote.
Accuris analytical balance calibration weight options — full grade hierarchy:
- W1101-6-100 (this product) — Class E2 set, 6 pieces, 100 mg – 100 g ($751) — highest precision
- W1100-200 — Class F1 set, 23 pieces, 1 mg – 200 g ($618) — high precision, broader range
- W1000-100 / -200 / -500 / -1000 — Individual F1 grade weights (100 g – 1000 g)
- W1005-1 through W1005-2000 — Individual M1 grade weights (1 g – 2000 g — lower precision, lower cost)
- W1000-TF — Tweezers ($42) — workflow-mandatory for all calibration weight handling
Pick the W1101-6-100 E2 set for semi-micro / regulated analytical balance calibration; sister F1 set covers broader-mass-range standard analytical workflows.
