For personal use, a digital scale with 0.01 gram resolution and a 200 to 500 gram capacity is best. If you weigh ounces, a 600 gram to 1000 gram scale with 0.1 gram resolution will work. For commercial or dispensary use, you need an NTEP-certified scale with 0.1 gram or finer accuracy and a capacity that matches your largest sale. Always check that the scale can be calibrated and tared.
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What to Look For
- Resolution: The smallest weight change the scale can detect. For cannabis, 0.01 g is good for personal use, 0.1 g is acceptable for larger amounts.
- Capacity: The maximum weight the scale can handle. Choose a capacity about 2 to 3 times the heaviest item you plan to weigh.
- Accuracy: How close the reading is to the true weight. Look for a scale with an accuracy of ±0.01 g or better for small amounts.
- Calibration: A scale that can be calibrated with a known test weight keeps accurate over time.
- Tare function: Lets you subtract the weight of a container so you only weigh the cannabis.
- Power: Rechargeable batteries or USB power are convenient. Some scales use coin cell batteries that need frequent replacement.
- Platform size: A larger platform can accommodate bigger buds or containers without spilling.
Parameter Bands
Match the scale's specifications to your typical load size and legal requirements.
- For personal use (1 gram to 1 ounce): 200 g to 500 g capacity, 0.01 g resolution, ±0.01 g accuracy.
- For larger quantities (up to 1 pound): 1000 g to 2000 g capacity, 0.1 g resolution, ±0.1 g accuracy.
- For commercial retail: 3000 g to 6000 g capacity, 0.1 g resolution, NTEP certification, ±0.1 g accuracy.
- For concentrates or small doses: 50 g to 100 g capacity, 0.001 g resolution, ±0.001 g accuracy.
Common Pitfalls to Avoid
- Cheap scales with no calibration: They drift and give inconsistent readings.
- Too coarse resolution: A 1 gram resolution scale is not good for small amounts.
- Overloading: Exceeding capacity can damage the load cell.
- Ignoring units: Some scales only measure in grams, others in ounces. Make sure it supports grams.
- Unstable power: Low batteries cause inaccurate readings. Choose a scale with a battery indicator or rechargeable battery.
- No wind protection: A draft can affect readings on high-precision scales. Use a cover or weigh in a still area.
FAQ
What accuracy do I need for weighing cannabis? For personal use, 0.01 gram accuracy is fine. For retail sales, you need at least 0.1 gram accuracy and NTEP certification where required.
Can I use a kitchen scale for cannabis? Most kitchen scales have 1 gram resolution, which is too coarse for small amounts. A dedicated cannabis scale with 0.01 gram resolution is better.
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How often should I calibrate my scale? Calibrate when you first get it, then every few weeks or if you drop it or move it often. Commercial scales may need annual certification.
Do I need a case or cover? A protective case prevents damage during storage. A cover or draft shield helps accuracy for high-precision models.