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A&D BM-20 - 22g x 0.000001g Ultra Micro Balance

SKU: BM-20~ea

SKU: BM-20~ea

This product may be backordered. General ETA is 10-14 business days for delivery. Please feel free to contact us: or 1-800-535-3751 to confirm stock / lead time. We appreciate your business!


A&D BM-20 - 22g x 0.000001g Ultra Micro Balance

A&D BM-20 lets you handle with confidence even trace quantities of valuable or degradable substances. Critical to precision weighing is static control, which is why the direct current fanless ionizer is standard on all models.

Sample weighing is at the centre of many laboratory processes, and the A&D Ion Series provides the performance, and features, standard accessories to bring real convenience and efficiency to your lab. Automatic response adjustment function uses environmental data from built-in sensors, to compensate for the balance’s characteristics to deliver fast and stable results.

Calibration is also automated and always available with a single keypress. A range of accessories adds extra convenience.

The BM-20 microbalance has the performance and standard accessories to simplify microgram measurements. The Ion Series now makes microgram ( µg ) measurements accessible to all researchers and offers a real choice in microbalances.

  • Built-in fanless Ionizer Standard
  • Large Weighing Chamber
  • Automatic Filter Response Adjustment due to drafts and/or vibration
  • Automatic Self Calibration due to temperature changes
  • GLP/GMP/GCP/ISO Compliant
  • Removable Separation Plate for Weighing of Taller Objects
  • Clear Metal Coated Anti-Static Glass
  • AD-1688 Data Logger Included


Max Capacity 22g
Readability 0.001mg 
Pan Size 25mm (50mm, 95mm for weighing filters)
Minimum weighing value 0.001mg
Repeatability 0.0025mg (for 1g) 
Linearity ±0.010mg 
Measurement Units g, mg, oz, ozt, ct, momme, dwt, GN, tael, tola,
Display Modes pieces (counting mode), % (percent mode), Specific gravity
Counting mode Minimum unit mass = 0.1mg / Number of samples = 10, 25, 50 or 100 pieces
Percent Mode Minimum 100% ref. mass = 10.0 mg / Minimum 100% display = 0.01%, 0.1%, 1% (depends on the reference mass stored)
Internal Memory 200 sets weighing data / 100 sets with date &time / 50 sets of calibration data
External Data Logger Store up to 5,000 weighing results with date &time to AD-1688 (standard)
Data Output GLP / GMP / GCP / ISO compliant. Outputs: balance manufacturer, model, s/n, balance identification number, date, time of calibration, mass used, and space for a signature.
Standard Interface RS-232C, Quick USB, External key plug for optional footswitch (SW:128)
Calibration Internal - Auto Self Calibration
Internal Calibration Motor-driven internal calibration
External Calibration Masses 20g, 10g, 5g, 2g, 1g
Sensitivity Drift (10 °C - 30 °C) ±2ppm/°C (when automatic self-calibration is not used)
Stablization Time 10s
Operating Temperature 5°C to 40°C (41°F to 104°F), 85%RH or less (non-condensing)
Product Dimensions 259 x 466 x 326mm
Weight 10kg / 22lbs
Breeze Break 252 x 140 x 165mm
Draft shield Yes
Ionizer electrode pin life Approx. 10,000 hours of continuous use. (User replaceable)
Power consumption Approx. 30 VA (supplied by the AC adapter)
Box Includes:
  • AC adapter
  • Instruction manual
  • WinCT (CD-ROM)
  • Weighing Data Logger (AD-1688)
  • Long Tweezers for calibration mass (AD-1689)
  • Standard Tweezers. BM-20/22 also includes
  • 2 filter weighing pans
  • microfuge holders
  • 3 sizes of disposable pans
    Additional Literature:

    BM Brochure
    BM Data Sheet
    BM Manual
    BM Manual Addendum 
    BM Breeze Break Manual