(Part 2) Reddit mentions: The best calibration products

NONONONONO!!! No dollar bills. The weight can be different depending on the age of the bill, the humidity in the room, and how long it's been in your hand or pocket. I advocate these because they're inexpensive, and accurate. Use nickles at the very least, but never paper money.

The resolution of my scale is 0.01gr. I would assume the instrument could have an inherent error (As all instruments)
Amazon sells calibration kits:
https://www.amazon.co.uk/Smart-Weigh-Calibration-Different-Milligram/dp/B00FM7VHUI/ref=sr_1_fkmr1_2?ie=UTF8&qid=1503180399&sr=8-2-fkmr1&keywords=1gr+calibration+weight.
I could question my reference, its legal, that said, the more measurements we have with similar instruments and cards could strengthen the results presented in this thread.

http://www.amazon.com/gp/aw/d/B003U9W8BM/ref=mp_s_a_1_2/182-1573071-3110618?qid=1408820061&sr=1-2

TIL!

And not very expensive.

I have these:
http://www.amazon.co.uk/gp/product/B00EPO9M2Y?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00

And I also have this:
http://www.amazon.co.uk/gp/product/B00FM7VHUI?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s01

I've tested item 1 with item 2 and they're consistently accurate to within 0.01g

eighty bucks on amazon (no that's not a referral link), but apparently they can go into the thousands for a set.

Looks like a balance weight set, except not sure what the jar with the powder would be.

Obecome 6Pcs 5g 10g 2x20g 50g 100g Grams Precision Steel Calibration Weight Kit Set with Tweezers for Balance Scale https://www.amazon.com/dp/B01E76H4QU/ref=cm_sw_r_cp_apa_i_y-d0DbT0ZNY3X

The other problem with my answer is the markings. Not sure what SCH would be, what's the other one marked as? Looks different.

Its a machinists bench block:
https://www.amazon.com/HHIP-3600-0042-Machinists-Bench-Block/dp/B00N4115UG

No problem, what your basically doing is getting a cheap version of this

Homebrew Materials:

Vacuum Pump Oil

Vacuum Tubing

1/4" Barb x 1/4" NPT Male Hose Fitting

1/4" Male x 1/4" Female NPT Extension Hose

Vacuum Pump

Filters

Spatulas

Magnetic Stir Bar

Digital Hotplate with Magnetic Stirrer

Nitrile Gloves (Better than Latex)

Empty Capsules (Buy Separated unless you hate your life)

Capsule Machine (If you value your sanity, buy more than a 100... I hated my life doing this)

Mohr Pipets

Pipette 10ml

Mortar and Pestle (If you're doing orals, get this... Otherwise, you're playing Russian Roulette with your doses and liver)

Funnel (For pouring into small places)

Alconox (For clean your shit)

Temperature Gun (How hot is my shit?)

Graduated Cylinder (If you measure with beakers, you're a fucking idiot... And you should consider Volumetric Flasks)

Beaker Set

1 Liter Beaker (Because brewing en'masse is better)

Scale (I have a 2kg one, too)

Calibration Weight Set

Calibration Weight 100g (Because you need two for the scale linked)

Vacuum Regulator (Unless you want to filter 9001 times due to broken shit)

Oil (Any USP grade, filtered or unfitlered)

BB

BA

Butyl Stoppers

Flip Top Seals

Crimper

Vials (Unsealed)

Autoclave (Cheaper than an oven, why are you using an oven?!)

Weight Boats (Buy a million of these. They're cheap and useful)

Did I miss something? Probably. Yes.

Requirements for gauge block wringing: Average surface roughness of at least 25 nm and flatness of at least 130 nm. The blocks do not need to be metal. It works even with clean blocks or under a vacuum. There is no or virtually no pressure required to wring blocks together. The strength from wringing two blocks can be as high as dozens of atmospheres.

Things this is not:

Van Der Waals Force/Gecko feet: Technically london dispersion forces. Between two flat planes with 10nm separation in a vacuum, the van der Waals-induced pressure is around .05 atm. This is two or three orders of magnitude too low. Its an additional order of magnitude lower under atmosphere. Additionally, the force is repulsive before its attractive.

Cold Welding: Cold welding only works with metals. Wringing works with any flat, smooth, hard surface. It also requires pressure, zero contamination, and no atmosphere. Also, cold welding would result in galling.

Magnetism/dielectric/electrostatic: Works with ceramic blocks, is independent of resistivity or electronegativity.

Some other kind of metal attraction/molecular attraction: These bond lengths occur over hundreds of picometers, and would be blocked by a film of any thickness or composition in between the blocks. Also beyond half a nanometer the force will be repulsive. In fact the longer the bond length, the more repulsive it will be initially. These bonds drop off with the sixth power of distance. (edit: straight from the mouth of the wiki: bodies have to be conformal to 1 nm or less to exhibit this.)

Casimir effect: Operates on a longer distance than van der Waals, and can cause pressures of 1 atm. at 10 nm. Still a little low to be the culprit. Also, as someone who worked in a nanotechnology lab, making devices that can fit in the space between gauge blocks- the Casimir effect is witchcraft and not to be trusted. By most formulations it would not describe what we see in gauge blocks. Among other things it should work MUCH more strongly for metals.

Surface tension: Maybe. But it doesn't work in vacuum or with clean blocks, so no.

Trapping a vacuum: No. If anything this should push them apart because you'll tend to trap air underneath the thing rather than trap vacuum. Also, the maximum force would be 1 atm, which is 50x lower than reality.

Trapped liquids: The idea here is that any amount of trapped liquid would try to vaporize if you pull the blocks apart, and since it doesn't want to do that the blocks stay together. This wouldn't keep the blocks together, just resist pulling them apart momentarily.

Personally I don't think we can say nearly anything about wringing without actual data, which I haven't seen. I suspect that it is mostly surface tension that does the high force stuff, and the effect is way weaker with clean surfaces, and that it probably has something to do with the casamir effect, and nobody is totally sure on that shit because it has confounded nearly every nontrivial experiment done with it. Primarily though- I'm not sure anyone has ever done an experiment with TRULY clean gauge blocks, which is way harder than you'd think. Dropping a block in acetone isn't good enough.