Right now the best is ultra-microbalance with 7 zeros. I was wondering why Mettler, Sartorius and other companies don't offer higher precision/resolution? I read that Sartorius at one time made a balance with half gram capacity to 8 decimal places for 50 million divisions. Both companies do have balances with over 50 million divisions but with less than 8 zeros(0.00000000g) I would be interested to know what exactly is the limitation of electromagnetic force restore technology? How many divisions resolution and how many decimal place precision?
Ive tested plenty based on strain gauge and found they aren't really capable of over 30,000 to 120,000 divisions before drifting, instability and poor repeatability occurs. Ive also found it's increasingly difficult to make resolutions above just two zeros(0.00g) and nearly impossible with three zeros(0.000g) Ive owned milligram balances on strain gauge and they typically are only accurate/repeatable to 3-5mg, sometimes even 10mg. They usually drift like crazy(doesn't matter if there's a draft shield or not) and it becomes stable when I utilize count mode to force a lower resolution of perhaps 0.005g increments.
Ive tested plenty based on strain gauge and found they aren't really capable of over 30,000 to 120,000 divisions before drifting, instability and poor repeatability occurs. Ive also found it's increasingly difficult to make resolutions above just two zeros(0.00g) and nearly impossible with three zeros(0.000g) Ive owned milligram balances on strain gauge and they typically are only accurate/repeatable to 3-5mg, sometimes even 10mg. They usually drift like crazy(doesn't matter if there's a draft shield or not) and it becomes stable when I utilize count mode to force a lower resolution of perhaps 0.005g increments.