Math question ....

[HippieChick]

How many mgs are in a gram. Like is 2 mg .002 on a gram scale or do I need a whole new scale? I am blonde and have forgotten all that stuff.

 

[ikkyu]

1g = 1000mg

Just remember that when you're counting decimal places, it goes 1/10ths, 1/100ths, 1/1000ths, and so on. So .002g is 2/1000ths of a gram, or 2mg.

 

[Vader]

If it helps you remember, mille is Latin for "thousand", so a milligram is 1/1000th of a gram. You could probably have gotten an answer quicker with Google.

 

[qwe]

fyi many gram scales could be plus or minus many mg's, they're not the most precise

 

[DavisK4high247]

gwe is correct about gramscales being a few grams of one way or another..But unless you are weighing out high powdered drugs and need to know within 5 to 10 miligrams then your ok,if you wanna really get a precise reading get a grain scale ,it's a triple beam type scale that measure in grains and 1/1oth grain increments..Grain scale is the saem as the old type pharmacy weights..example 1/4 grain = 15 miligrams like in a tylenol #2,, or a MScontin 15mg,,,1/2 grain = 30 mg which is a tylenol #3 cocdeines content of codeine 30mg or 1/2 grain.and finally the tylenol #4 = tylenol plus 60mg of codeine which is 1 grain=60mgs...ya dig it?lol

 

[fryingsquirrel]

How many mgs are in a gram. Like is 2 mg .002 on a gram scale or do I need a whole new scale? I am blonde and have forgotten all that stuff.

If your scale weighs to .002 (which is 2mgs) then it isn't a gram scale, it's a milligram scale. That is unless you have it set to weigh in ounces or something, in which case

 

[lightitup]

.002 yes, but it could be anywhere between 1.5 and 2.5mg in this case. The last number is rounded off.

If you are dealing with substances that are active in doses as low as 2mg, please, for your own safety make sure that you have a very accurate and reliable scale.

 

[TheAzo]

Cheap milligram scales are GARBAGE.

Those cheap chinese import scales should be treated as if they're a 0.01mg scale, even if they are readable down to 0.001mg.

Anything that's battery powered and doesn't look like it belongs in a laboratory should be assumed to be treated as a 0.01mg scale, and shouldn't be trusted to weigh anything smaller than 50-100mg.

Sucks, but unfortunately it seems to be the case. If you need a decent scale, you need to either use dilution, or go on ebay and get a used lab scale. I got one that performs _spectacularly_ and is readable down to 0.1mg (tenth of a milligram) for $75. The display is a bit dodgy, which is probably why it was so cheap, but with some squinting it works fine.

To quote from a forum I can't link to...

The first scale that I evaluated was labeled “Diamond” and looked identical to an American Weigh Systems Dia-10, but was probably either a knockoff or an “overrun” (It is very common in China for a factory to assemble more of a particular design and then put another brand name on it). It was purchased from eBay for about $60 over a year ago.
Stability: This scale took several minutes before I could tare it and it would hold its “zero” for at least 10-15 seconds. But then I was pleasantly surprised that it held its “0.000” reading after taring extremely well. However, when I put a 10mg weight on it the reading varied from “0.014” to “0.007” in less than a minute. What’s happening here? The “0.000” was holding so well when I tared it. First lesson learned – “0.000” does not mean “0.000” on this scale, but rather “almost zero”. (Note: The scale designer probably wanted to make this scale look “real good” with “0.000” showing, so he resorted to some digital trickery that does not allow the display to change much unless the reading changes significantly from zero.) How much is the effect? After taring and getting a “0.000” display, I could routinely put about 4 mg on the scale (very gently) and the scale would still display “0.000”! I then used a small salt shaker to slowly put weight on the pan after getting a “0.000” reading and was able to once get 7.4 mg of salt on the scale before it stopped displaying “0.000”, but then the scale only read “0.002”.
Accuracy: I figured that the primary range of interest for this scale would be 0 to 500 mg, so all of the accuracy testing was done in this range using my milligram calibration weights. This testing was done after about 10 minutes of warm up after powering on the scale (like most of the low-cost milligram scales, this scale has an auto “power off” function after a couple of minutes. I found this annoying) and calibration using the included 5 gram (which was 3 mg heavy) and 10 gram (which was 8 mg light) calibration weights.
Then the scale was then tested using my milligram weights. During these tests there appeared to be significant variation when the weights were repeatedly put on and taken off, with a taring step before putting the milligram weight back on the scale. The errors seemed to be nearly independent of weight size at the low end (up to, and including 20 mg) and were routinely about +0/-6 mg, and grew to +3/-12 mg for 500 mg weights.
It is clear that this scale had significant hysteresis, offset and linearity error, which was particularly noticeable in the low weight range.
Assessment: This particular scale could be dangerous for someone using it in the low range (up to 20 mg) because the errors stack up against the user. It is possible that it would read 5 mg too low for an actual weight of 7.4 mg, i.e. read “0.002” when it actually had 7.4 mg on the pan (2Cx & JWH users take note!), and that error was still 15% (could read “0.043” for and actual 50 mg load) in the mid-weight ranges of interest. This scale makes a great case for using the “serial dilution” approach to measure small doses (<25 mg) of RCs and using this type of scale to measure the initial amounts of greater than 500 mg (where the error is finally only about 3%) used to make the solution.

His results are consistent with mine with a similar scale. My 0.001mg chinese scale is, in terms of practical measurement, no more accurate than my 0.01mg scale

 

[HippieChick]

This is what I got off Ebay ... 0.001 - 20g Digital Weighing Gem Jewelry Diamond Scale

Well there was a picture but it's not here ...
Features:

6 different weighing modes
Tare’ button – weigh items in a container – the tare button will subtract the container weight from the total reading
Spacious weighing platform
Backlit LCD screen
3 minute auto power off saves battery life
Low battery alarm
Cover and pouch protect scales when not in use
Maximum weight: 20g/0.001g, 0.7055oz/0.0001oz, 100.00ct/0.005ct, 0.6430ozt/0.0001ozt, 12.860dwt/0.001dwt, 308.65gn/0.001gn
Display: 5 digit blue backlit LCD
Auto power off: 3 minutes
Operating temperature: 10 - 30°C
Scale dimensions: 9 x 10 x 3cm (3.5 x 4 x 1.2 ”)
Screen dimensions: 3.2 x 2.2cm (1.2 x 0.5 ”)
Weighing platform diameter: 2cm (0.7")
Powered by: 2 X AAA batteries (Not included)
Packing:


1 x Digital Pocket Scale (0.001g x 20g)
1 x Robust Plastic Case Cover
1 x 10g calibration weight
1 x Weighing pan
1 x Leather Pouch
1 x English Instruction Manual
100% Brand New

So here's some more information on it. I only paid like $15 but it comes from good old new york (which I'm sorry to say I haven't had the best of Ebay luck from)and not hong kong. It may do the trick, but yes I really need one that will weigh precisely 2 mgs and will tell me + or - a miligram for mine and his. I have a high tolerance and hubby does not. SO we will see.

Oh my bad: it actually came from Hong Kong. But I resold it on Ebay for $31 as the need doesn't exists anymore ... they've outlawed the jwhs here now too. Which is alright, the synthetics were wigging me out.

 

[DavisK4high247]

hey the Grain scale i mentioned is a small triple beam and is accurate to 1/100th of a grain which is equal to about 1.5 mg plus or minus but mine is actually closer to being withing 1/2 of a miligram and it can be bought as a "gunpowder reloading scale " i think its an Ohauss or something,not cheap but not too expensive either and its easy to get a conversion from grains to grams and mg's online and print it off or write it..i loaned mine to someone weighing out some stuff that was like 50mg bags of a powder,and they knew the weight of the bag within a mg or less and then added the powder into the hanging ,dtachabble metal container thing and then put it into they bag ,and they could have withing a mg or actually closer to 1/2 a mg the total weight of the powder and this helped them to know when they neeeded to cut this powder if it was very potent how too accurately know how much percent they had cut the powder,even if they only knew within 5 or 10% of the actual powders purity they would know withing less than a 1% variance,,much less how much they had cut the powder...

 

[TheAzo]

This is what I got off Ebay ... 0.001 - 20g Digital Weighing Gem Jewelry Diamond Scale

Well there was a picture but it's not here ...
Features:

6 different weighing modes
Tare’ button – weigh items in a container – the tare button will subtract the container weight from the total reading
Spacious weighing platform
Backlit LCD screen
3 minute auto power off saves battery life
Low battery alarm
Cover and pouch protect scales when not in use
Maximum weight: 20g/0.001g, 0.7055oz/0.0001oz, 100.00ct/0.005ct, 0.6430ozt/0.0001ozt, 12.860dwt/0.001dwt, 308.65gn/0.001gn
Display: 5 digit blue backlit LCD
Auto power off: 3 minutes
Operating temperature: 10 - 30°C
Scale dimensions: 9 x 10 x 3cm (3.5 x 4 x 1.2 ”)
Screen dimensions: 3.2 x 2.2cm (1.2 x 0.5 ”)
Weighing platform diameter: 2cm (0.7")
Powered by: 2 X AAA batteries (Not included)
Packing:


1 x Digital Pocket Scale (0.001g x 20g)
1 x Robust Plastic Case Cover
1 x 10g calibration weight
1 x Weighing pan
1 x Leather Pouch
1 x English Instruction Manual
100% Brand New

So here's some more information on it. I only paid like $15 but it comes from good old new york (which I'm sorry to say I haven't had the best of Ebay luck from)and not hong kong. It may do the trick, but yes I really need one that will weigh precisely 2 mgs and will tell me + or - a miligram for mine and his. I have a high tolerance and hubby does not. SO we will see.

I think you're going to have to use liquid dosing - that's one of the el-cheapo milligram scales like the guy I quoted reviewed, and I wouldn't trust them to weigh out a dose of 10mg, let alone 2. It sounds like the same shp

For measuring a 2mg dose of something, you need a scale accurate to 0.1mg, not 1mg, because the difference between 1.5mg and 2.5mg of something with a dose of 2mg is too large.

What substance are you dosing with it, may I ask?

 

[flat line]

meth or math?