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  #1  
Old 05-21-2020, 05:36 PM
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Tau Zero Tau Zero is offline
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Exclamation Scientific scale for weighing parts

To quote Magnus Pyke (see below), "SCIENCE!"

I'm looking for an accurate (but affordable) scientific scale to weigh rocket parts, etc., in both grams and ounces (for accurate entries into Rocksim, etc.).

I came across the following listing from a Big Box Store website, and I'm wondering if it will do.

For those of you who are experienced at this sort of thing, please respond accordingly. Thanks in advance!


**

"Insten

Silver New 200g x 0.01g Mini Digital Scale Jewelry Pocket Balance Gram LCD US

$7.97 List - WAS $19.99


Features

... lets you weigh gemstones and pieces of jewelry for precise valuation. It has a weight capacity of between 0.01 and 7.06 oz, which makes it sensitive enough for delicate work. This mini digital scale is small enough to fit in a purse or your pocket for easy transport. The unit powers down after 60 seconds without being used, which saves battery power. It automatically calibrates to save you time.

Suitable for precise weighing
Color: silver
Pocket size: 120 x 63 x 20 mm/ 4.72" x 2.48" x 0.79"
Capacity: 0.01 to 200 g/ 0.01 to 7.06 oz
Division value: 0.01g/ 0.01 oz
Multi-unit display: g/tl/oz/ct
...
Mini digital scale has a tare function
Overload protection system
User manual is included
Powered by: 2 x AAA battery (batteries not included)"

**
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  #2  
Old 05-21-2020, 05:49 PM
aeppel_cpm aeppel_cpm is offline
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My experience with scales in that price range is that the rare isn’t very trustworthy and I wouldn’t believe the last digit. I’d also tap it and let it settle a couple of times and recheck the weight.

There are some in the $50 price range at homebrew stores that are .1g up to about a kilo. You can put a whole good sized rocket on it. Tate/repeat weight is still an issue.

If you could afford it, an Ohaus Scout is pretty nice.
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Old 05-21-2020, 06:57 PM
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Harbor Freight has them, but not sure they are open. If so, use one of their 20% off coupons to save a couple dollars. I’d avoid a tiny one if the rocket cannot stand on it. Mine has a round weighing platform about 6” in diameter.
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Old 05-21-2020, 08:25 PM
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I just use postal scales. It gets me close enough and does both English and metric.
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Old 05-21-2020, 08:58 PM
RobVG RobVG is offline
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Old 05-21-2020, 09:09 PM
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Jay,

I have one of that particular model and it works just fine. I carry one that size in my range box that I take to FAI events. The amount that it might be off won't be significant for anything you do.

I also have a bigger one that I use as my desktop building room scale.

https://www.ebay.com/itm/143040047516

It comes from China so it would take it a while to get here now but I've ordered from them a couple of times. Great scale and large enough platen to stand a finned rocket on it. Again, I can't imagine you need more accuracy than what I need for FAI models.

Hope this helps.

Steve
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Old 05-21-2020, 09:40 PM
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Quote:
Originally Posted by LeeR
Harbor Freight has them, but not sure they are open. If so, use one of their 20% off coupons to save a couple dollars. I’d avoid a tiny one if the rocket cannot stand on it. Mine has a round weighing platform about 6” in diameter.
Lee,

Is yours about this size?

https://www.harborfreight.com/digit...r_psugg_q=scale
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"Your lightyears may vary."


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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Old 05-23-2020, 08:19 AM
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Ltvscout Ltvscout is offline
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I go analog vs digital for my scale. I have an old classic, an Ohaus Triple Beam.
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  #9  
Old 05-23-2020, 01:15 PM
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I recommend this one from AWS.

https://www.amazon.com/American-Wei.../dp/B002SVQHWY/

It has two accessories most comparable scales don't include: calibration weights and an AC adapter. I like that it can run on batteries to take out in the field or on a power cord for use at home.
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Old 05-23-2020, 10:31 PM
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Quote:
Originally Posted by eljefe
I recommend this one from AWS.

https://www.amazon.com/American-Wei.../dp/B002SVQHWY/

It has two accessories most comparable scales don't include: calibration weights and an AC adapter. I like that it can run on batteries to take out in the field or on a power cord for use at home.
Thanks!

Yeah, I read the instructions for one scale: "To calibrate the scale, put an object weighing 2500g (5.5 oz) on the scale. Remove it, and put another object weighing the same amount. Your scale is now calibrated."

WTH? I have to come up with two identical objects? What good are *you,* scale manufacturer?

(shrug, heavy sigh of resignation)

IRONY: Price: $24.99 & FREE Shipping on orders over $25.00...



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Jay Goemmer
"Centuri Guy"/"Tau Zero"
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NAR 86131

"Your lightyears may vary."


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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