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The W1105-21-100 is an M1-grade calibration weight set with sub-milligram coverage — 21-piece set covering 1 mg to 100 g range. The lower-cost M1 alternative ($184) to the F1-grade W1100-200 set ($618) when sub-milligram calibration coverage is needed but F1 tolerance is over-engineered for the workflow.
For complete OIML M1 grade selection rationale, see the W1105-8-50 parent page.
| SKU | W1105-21-100 |
| Type | Class M1 calibration weight set, 21 pieces (with sub-milligram coverage) |
| Mass range | 1 mg to 100 g |
| Accuracy class | M1 (OIML standard) |
| Compatible balance grades | Standard / industrial balances (10 mg readability+) requiring sub-milligram calibration coverage |
| Set composition (typical 21-piece M1 1mg-100g set) | 1 mg through 100 mg sub-milligram values + 1 g through 100 g full mass-range coverage |
| Companion accessory | W1000-TF Tweezers ($42) |
| F1-grade alternative | W1100-200 (23-piece F1 set, 1 mg – 200 g, $618 — for analytical balance calibration) |
| List price | $184 |
| SKU | Pieces | Mass range | List price |
| W1105-8-50 | 8 | 1 g – 50 g | $149 |
| W1105-12-500 | 12 | 1 g – 500 g | $272 |
| W1105-13-1000 | 13 | 1 g – 1000 g | $339 |
| W1105-21-100 (this product) | 21 | 1 mg – 100 g (sub-mg coverage) | $184 |
| W1105-22-200 | 22 | 1 mg – 200 g (sub-mg coverage) | $221 |
| Set | Grade | Mass range | List price | Best for |
| W1105-21-100 (this product) | M1 (standard precision) | 1 mg – 100 g | $184 | Standard / industrial balance calibration with sub-mg verification (cost-optimized) |
| W1100-200 | F1 (high precision) | 1 mg – 200 g | $618 | Analytical balance calibration with sub-mg verification (regulated labs) |
M1 vs F1 cost differential: $434 ($618 − $184). For sub-milligram calibration, the choice depends on:
Standard / industrial balance calibration with sub-mg coverage — workflows where the standard balance has very low minimum-readable values (e.g., 1 mg readability standard balance) but full F1 precision is over-engineered.
Educational analytical chemistry programs — graduate-level programs introducing OIML calibration concepts on a budget-tier set with sub-milligram exposure.
Cost-optimized regulated labs — non-regulated lab procurement where sub-mg coverage is valuable but F1 cost premium is not justified.
Method-development workflows — protocol-development workflows where sub-mg calibration verification is part of the method.
Pair with W1000-TF tweezers. Sub-milligram weights are the most contamination-sensitive — tweezer handling is critical.
Confirm case / storage. Sets ship with protective case + weight-position cutouts.
Confirm at quote: balance grade and capacity, sub-milligram coverage need, M1 vs F1 grade decision, case inclusion, and lead time.
Warranty: Per Accuris standard accessory terms — confirm at quote.
Accuris W1105 M1 Grade Calibration Weight Set family (see table above for full set-size ladder).
Pick the W1105-21-100 M1 set for cost-optimized sub-milligram coverage; step to W1100-200 F1 set for analytical / regulated calibration.
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