The W1005-1 is a 1 gram OIML M1 grade calibration weight — for standard / industrial balance calibration (10 mg readability+) where the higher-precision F1 grade weights (W1000 family) are over-engineered for the workflow and budget-tier procurement matters.
Key Specifications
| SKU | W1005-1 |
| Type | Calibration weight — OIML M1 grade |
| Mass | 1 g |
| Accuracy class | M1 (OIML standard) |
| Compatible balance grades | Standard / industrial balances (10 mg readability+) |
| Sister M1 weights | W1005-2 (2 g), W1005-5 (5 g), W1005-10 (10 g, $21), W1005-20 (20 g), W1005-50 (50 g), W1005-100 (100 g), W1005-200 (200 g), W1005-500 (500 g), W1005-1000 (1000 g), W1005-2000 (2000 g) |
| Sister grade SKUs | W1000 family (F1 grade — higher-precision weights for analytical / precision balances) |
| Companion accessory | W1000-TF Tweezers ($42) |
| List price | $17 |
OIML M1 vs F1 Grade Decision
| Grade | OIML class | Tolerance (1 g) | Compatible balance | Use case | Per-weight cost |
| F1 (W1000 family) | High-precision | ±0.05 mg | Analytical / precision balances | Pharmaceutical, biotech, regulated labs | $77+ (100 g) |
| M1 (this product family) | Standard | ±0.5 mg | Standard / industrial balances | Educational labs, basic weighing, budget-tier | $17 (1 g) — far lower |
Pick M1 grade (W1005) when:
- Balance is standard / industrial grade (10 mg readability+ — typical bench-top weighing balances)
- Workflow is educational / training where calibration concepts are being taught vs regulated calibration
- Budget-tier procurement is the priority
Pick F1 grade (W1000) when: balance is analytical / precision grade, regulated environment (FDA / GLP / ISO 17025), or workflow requires the tighter F1 tolerance.
W1005 M1 Calibration Weight Family
The W1005 family covers a comprehensive sub-gram-to-2-kg mass range matching the W1005-1 (this product) entry:
| Mass | Use |
| 1 g (W1005-1, this product) | Sub-gram calibration; small-mass verification |
| 2 g (W1005-2) | Sub-gram calibration |
| 5 g (W1005-5) | Sub-gram calibration |
| 10 g (W1005-10, $21) | Mid-low calibration |
| 20 g (W1005-20) | Mid-low calibration |
| 50 g (W1005-50) | Mid calibration |
| 100 g (W1005-100) | Mid calibration |
| 200 g (W1005-200) | Standard mid-range |
| 500 g (W1005-500) | High-range |
| 1000 g (W1005-1000) | Full-range for 1 kg balances |
| 2000 g (W1005-2000) | Full-range for 2 kg balances |
The M1 family covers a broader mass range than F1 (which stops at 1000 g) — supporting standard / industrial balances at higher capacities.
Application Profile
Standard / industrial balance calibration — non-analytical balances at 10 mg readability+ (typical lab bench-top weighing balances).
Educational laboratory calibration training — undergraduate / graduate analytical chemistry programs introducing calibration concepts on a budget-tier weight set.
Multi-balance facility calibration program — facilities with mixed analytical (F1 weights) + standard (M1 weights) balance inventory benefit from both weight grades.
Budget-tier calibration procurement — labs where F1 grade weights are over-engineered for the workflow benefit from M1 grade at lower per-weight cost.
Sub-gram balance verification — calibration of low-mass-range balances or balance-zero verification.
Ordering & Configuration
Pair with W1000-TF tweezers. M1 weights still require proper handling — skin contamination matters less for M1 tolerance vs F1, but tweezers remain best practice.
Pair with multiple mass values for full-range calibration coverage. Most labs procure a calibration-weight set spanning the balance's full mass range.
Confirm at quote: balance grade in lab inventory (standard / industrial vs analytical / precision — M1 vs F1 selection), full mass-range coverage, W1000-TF tweezers inventory, and lead time.
Warranty: Per Accuris standard accessory terms — confirm at quote.
Accuris W1005 M1 Grade Calibration Weight family:
- W1005-1 (this product) — 1 g ($17) — sub-gram entry
- W1005-2 — 2 g
- W1005-5 — 5 g
- W1005-10 — 10 g ($21)
- W1005-20 — 20 g
- W1005-50 — 50 g
- W1005-100 — 100 g
- W1005-200 — 200 g
- W1005-500 — 500 g
- W1005-1000 — 1000 g
- W1005-2000 — 2000 g (largest in M1 family)
Pick M1 grade for standard / industrial / educational balance calibration; sister F1 grade family (W1000) covers analytical / precision balance calibration at higher cost.
