Pfafffed
Bluelight Crew
- Joined
- Jun 30, 2015
- Messages
- 1,847
You inspired me, Buzz.@Psychestim have you tested your new fancy scale against your old one?
I compared a seven year old Gemini scale with fresh batteries against an inexpensive ($500) laboratory balance accurate to one more decimal point. The scales were used on the same surface, but the lab balance was self-levelling. Wind shields were used (when possible) and scales were kept at some remove from other sources of electromagnetic interference. Both scales were calibrated before testing using the same calibration weights.
After calibration, the Gemini showed one 10g weight consistently as 10g, the other vacillated between 10g and 9.999g [1mg off]
The laboratory balance showed a consistent weight of 10g with both weights.
As I don't have any milligram-sized calibration weights, I chose to weigh 6.0mg of weighing paper on the laboraory balance.
When tared using weighing pan, the Gemini did not register the weight of the paper at all during the first attempt. After the second attempt, it vacillated between 4mg and 5mg. [1-2mg off]
When the weighing pan was used without taring, the weight of the weighing paper was shown to be 5mg. [1mg off]
All in all, this indicates a remarkable level of accuracy for the price, a degree consistent with what others have reported. Mind you, a difference of 1-2mg can make a substantial difference with many substances (looking at you, 2C-E) which reinforces the benefits of starting with large amounts of weighed material for volumetric dosing when possible.
My biggest issue in the past with the Gemini scale is issues with weighing small amounts of material, inconsistent weigh results with the same sample, and weight creep/flux with a sample on the scale. These are small, but significant frustrations. Still, for the price, the Gemini scale is a remarkable tool.