Choosing a Lab Balance: Units, Readability, Accuracy and Settling Time Explained

New to lab balances? Learn what readability, accuracy, units and stabilization time mean, and how to pick the right Fristaden Lab balance for your work.

Open any balance spec sheet and you'll see a wall of numbers: capacity, readability, linearity, stabilization time. They aren't hard to read once you know what each one means. Below, we break down each spec in plain language and show where Fristaden Lab balances sit.

⚖️ 1. Weighing units: what is it measuring in?

Most balances weigh in grams (g), but the unit list varies a lot between models.

• Grams, milligrams and kilograms are standard for lab, formulation and kitchen-scale work.
• Ounces (oz) and pounds (lb) are common in US shipping, food and packaging.
• Carats (ct) are used for gemstones. One carat is 0.2 g.
• Troy ounces (ozt), grains (gr) and pennyweights (dwt) are used for precious metals, ammunition and jewelry.
• Regional and trade units such as taels and momme turn up in jewelry and textiles in parts of Asia.

If you only ever work in grams, a simple unit list is fine. If you're converting between systems all day, a model with more built-in units saves you from doing the math by hand.

🔩 2. Capacity: the most it can weigh

Capacity is the maximum load the balance can handle. Going over it can damage the sensor, so choose a capacity a little above your heaviest sample. Capacity and readability tend to trade off: the higher the capacity, the coarser the smallest step.

📌 3. Readability: the smallest step you can see

Readability is the smallest difference the display can show.

• 0.5 g is fine for counting parts or weighing bulk goods.
• 0.01 g (one hundredth of a gram) suits formulating, soap and cosmetics batches, and general lab prep. A standard paperclip weighs roughly 1 g, so this is about 1% of a paperclip.
• 0.0001 g (0.1 mg) is analytical-grade. It's used for pharmaceutical work, reference standards and anything where tiny amounts matter.

Don't buy more readability than you need. Finer resolution costs more, settles more slowly and is more sensitive to drafts and bench vibration.

🎯4. Accuracy: readability's less glamorous cousin

Readability is not accuracy. Readability is what the display can show. Accuracy is how close the reading is to the true weight.

On our spec sheets, accuracy appears as linearity error. It tells you how far the reading might drift from the true value across the balance's range. For example, a Fristaden Lab balance with 0.01 g readability and ±0.03 g linearity can display hundredths of a gram, but across its full range any single reading could be off by up to three hundredths.

Accuracy also depends on calibration. Some Fristaden Lab balances calibrate internally (automatically, with a built-in weight). Others calibrate externally using the calibration weight included in the box. Either way, regular calibration keeps your readings trustworthy. Our balances ship with a manufacturer calibration certificate, and we cover how to read one in [link: Calibration Certificate post].

⏱️5. Stabilization time: the "lag"

When you place a sample on the pan, the number jumps around before it settles. Stabilization time is how long that takes.

• ≤3 seconds: fast, ideal for counting and repetitive weighing.
• ≤5 seconds: typical for precision balances.
• ≤8 seconds: typical for analytical balances. Their very sensitive sensors pick up the smallest disturbances, so they take a moment to settle.

The more precisely a balance measures, the longer it takes to settle and the more it cares about its environment. Keep it on a level, stable surface away from fans, vents and foot traffic.

🚧 6. Sensor type: why analytical balances behave differently

Our analytical balances use a high-accuracy electromagnetic force sensor, which is built for very fine measurement. Our precision, counting and specialty balances use a load cell, which is quick, durable and well suited to everyday weighing.

Quick picker

• Weighing milligram-level amounts? Choose the Fristaden Lab FA224NPRO.
• Mixing batches in grams? A 0.01 g balance (YP, HC, HTP312 or RD Series) is the sweet spot.
• Want lots of units or built-in functions? Look at the YP Series or the Touch Screen Balance.
• Counting parts or weighing heavy loads? The Fristaden Lab Counting Scale or a high-capacity HC Series model.
  
  

  Frequently Asked Questions

  What's the difference between readability and accuracy on a lab balance?
  Readability is the smallest increment the display can show, such as 0.01 g or 0.0001 g. Accuracy is how close a reading is to the true weight. On Fristaden Lab spec sheets, accuracy is listed as linearity error. For example, a Fristaden Lab YP Series balance reads to 0.01 g with a linearity error of ±0.03 g.

  What readability do I need for small-batch formulating?
  For most batch work measured in grams, a 0.01 g balance is a common choice, such as the Fristaden Lab YP Series, HC Series, HTP312 Series. If you're weighing milligram-level amounts, you need an analytical balance like the Fristaden Lab FA224NPRO, which reads to 0.0001 g (0.1 mg).

  What is stabilization time?
  Stabilization time is how long a balance takes to settle on a steady reading after you place a sample on the pan. Fristaden Lab counting scales, the YP Series and the Textile Scale settle in ≤3 seconds. Our other precision balances settle in ≤5 seconds, and our analytical balances in ≤8 seconds. Higher-resolution balances take longer because their sensors respond to smaller disturbances.

  What's the difference between internal and external calibration?
  An internally calibrated balance adjusts itself automatically using a built-in weight. An externally calibrated balance is adjusted manually with a separate calibration weight. The Fristaden Lab FA224NPRO and Analytical Balance are available with either option. Our precision balances use external calibration, and most include a 500 g calibration weight in the box.

  What's the difference between an analytical balance and a precision balance?
  An analytical balance reads to 0.0001 g (0.1 mg) and has a lower capacity. The Fristaden Lab Analytical Balance handles up to 210 g. A precision balance reads to 0.01 g or 0.1 g and handles higher capacities, from 1,000 g up to 30 kg across our catalog. Analytical balances also take a little longer to settle (≤8 seconds versus ≤3 to ≤5 for precision models).

  Which Fristaden Lab balances offer the most weighing units?
  The Fristaden Lab YP Series and Touch Screen Balance each include 19 built-in units, covering grams, carats, ounces, troy ounces, pounds, grains and pennyweights plus regional units. They also allow one user-defined unit.

  
  

Still unsure whether you need precision or analytical? See our blog post: Precision vs. Analytical Balance, or browse our Balance Buying Guide.