Yes it is, it is the remaining SI standard defined by a physical object
They donât say what material it is but thats good to know for real life calibration weights
Since iâm too lazy to look it up how much would real calibrations in fasttechâs weights cost?
I canât remember all the places I bought them, mostly ebay I think, been buying for the last 5 years. I keep losing these for some reason. Latest bought was at least a year ago for $3.+ (40kg hanging scale, 10g precision from BIC) and even this one is pretty good. My most precise one was 0.001g x 20g max, I use it to weigh plant hormone in dust form that needs precision in ppm, this scale works well after the first 0.010g and seem linear enough. I think this costed me like $20 or so, and this is the most expensive one I have.
The one I use daily to weigh coins is 3kg x 0.1g, I use the piece counter, always produce correct and repeatable result. Been using this for 2+ years.
Your requirement of 0.5g precision is easy though, I think any 1kg scale will do that.
Why do you weight coins?
Counting. Our coins have relative weight (except the latest ones) - 10c weigh twice of 5c, and 20c weigh twice of 10c. Simply use the count piece feature on the scale.
According to Wikipedia you are right. I am surprised. I couldnât think of a way to define it, but I assumed there was a way and I just hadnât heard what it was. If I am right this time, meters, kilograms (or centimeters, grams) and seconds are enough to define everything else. Perhaps the choice of the three fundamental units will have to be changed to time and something that is easier to standardize than mass. Of course you couldnât really fool them enough to matter industrially or commercially, but in principle whoever has the standard could give some people more accurate secondary standards than others.
That could backfire: Chinaâs standard would eventually be accepted internationally and the old one would become wrong.
Here is one proposed physical weight replacement. Kibble balance - Wikipedia
The propeller heads are still duking it out over what the non-physical mass replacement will be.
A physical replacement for the current mass standard is being made by depositing (silicon?) atoms into a spherical (?) shape, and counting them 1 by 1 as they do it.
i guess you didnât saw the video i posted in this thread?
i saw, that is to say i seen :bigsmile:
(simpsons reference, anybody?)
I usually have my Flash player turned off because it slows down this little computer.
Why wouldnât you? Simple enough to make and repeatability is highly likely. For anything other than chemistry they should work well enough, if not try these Big price difference. Or if youâre feeling really flash celebrate the year of the horse in style, or just hang around in bars.
E2 weights are crap⌠you want Class 0 or Class 1 weights⌠uhhh, BIG price differenceâŚ
http://www.troemner.com/weights_analytical.php
I wish they had prices
Oh, they have prices! Large, fat, juicy, OMG, WTF, youâve got to be kidding prices⌠More than a $10 set of digital calipersâŚ
I can imagine, i assume their calibration service costs as least three figures if not four
What doesnât these days. I was just quoted $1200 to have somebody measure my ESI SR104 resistor⌠but then it is the worldâs most accurate resistor. Your typical CPPSLTS freebie DMM just wonât do.
such a freebee is not found in these parts, though mine did cost high single digits on sale, and is perhaps a fair percentage as accurate
What is CPPSLTS?
Chinese Political Prisoner Slave Labor Tool Store.
I was at a Harbor Freight store (where they very cheap tools at low prices) and overhead a customer asking a salesman how they can sell something for so little. The salesman responded, âWhen you have a few million political prisoners making your stuff for nothing, it gets cheap.â