Lab Balances

Choosing readability: 0.1mg or 0.001g

Readability is the smallest step the display shows. Start with the tolerance on the work you're weighing, not the balance. The 0.1mg models (0.0001g) suit sample prep, reference weighing and anything where a few milligrams matter. The 0.001g models (1mg) suit general laboratory weighing, batching and checks where that step is fine enough.

Readability isn't accuracy, though. Look at repeatability as well. The 0.1mg analytical balance models list repeatability of ±0.0002g and linearity of ±0.0003g. The 0.001g models list ±0.002g repeatability. A balance that displays a digit it can't repeat gives you false confidence.

• 0.1mg (0.0001g): FA2004E, FA1204E, FA2204E and their N versions
• 0.001g: FA2003S, FA3003S, FA5003S and the YP1003Q, YP2003Q and YP3003Q laboratory balance range
• Minimum weighing on the 0.1mg models is 0.0004g, so very small samples need care

Matching capacity to your samples

Higher capacity usually means a coarser readability for the same class of instrument, so don't buy more range than you use. The 0.1mg analytical balances cover 120g, 200g and 220g. The 0.001g analytical models reach 200g, 300g and 500g. The YP laboratory balance models run at 100g, 200g or 300g.

Weigh your heaviest container plus sample, then pick a capacity above that. Tare weight counts against the limit. If you often weigh light samples in heavy vessels, a higher-capacity 0.001g model may serve you better than a 0.1mg one.

Draft shield, stabilisation and interface

At 0.1mg, air movement and heat change the reading. A glass draft shield with sliding doors keeps the chamber still, and the FA2004E lists glass with top and side sliding doors. Some listings carry a clear plastic windshield instead, so check which one your model has.

Stabilisation time affects throughput. Listed values range from 1.5 seconds to 3 seconds or less. For logging results, RS232 or RS232C is standard on the listed models. RS485, USB and printer connections are listed as optional on some, so confirm what ships with your option before you order.

How to use and calibrate an analytical balance

Set the balance on a stable, level surface away from vents and vibration. Let it warm up, close the draft shield, tare, then add the sample. Handle weights and vessels with clean tools so you don't add mass or moisture.

Calibrate against certified reference weights when the balance is moved, levelled again, or after a change in conditions. Follow the procedure in the manual for your model, since the calibration routine differs between instruments. Compel doesn't state a calibration certification on these listings, so ask for documentation if your quality system needs it.