Pep Pens calibration?

[cooleql]

Hi guys,

I recently purchased the peptide injector pen from PepPens and having difficulties in dispensing exact amount of liquid from it. I did a quick experiment by turning the knob to 10 unit , dispensed BAC water on a digital milligram scale. The water weight about 0.08 mg on the scale at 10 unit setting. i did a repeatability test at various setting, it was consistently off by 0.02 mg. For eg: I set the dial at 60 units and measured .581 mg.

I did the same test on an insulin syringe and the it dispensed exactly 0.1 mg at 10 unit setting. Any thoughts?

 

[Jailbreak7]

sounds close enough for (chinese) government work?

it sounds like you just need to give it one or two clicks?

 

[GimmeABreak]

Hi guys,

I recently purchased the peptide injector pen from PepPens and having difficulties in dispensing exact amount of liquid from it. I did a quick experiment by turning the knob to 10 unit , dispensed BAC water on a digital milligram scale. The water weight about 0.08 mg on the scale at 10 unit setting. i did a repeatability test at various setting, it was consistently off by 0.02 mg. For eg: I set the dial at 60 units and measured .581 mg.

I did the same test on an insulin syringe and the it dispensed exactly 0.1 mg at 10 unit setting. Any thoughts?

Do you know the measurement uncertainty of your scale in the miligram measurement range? Also, I am not sure of the weight of BAC water with peps. Should a 10u volume weigh 10mg, I have no idea. If you are testing with water I am sure you can calculate the expected weight by volume but not sure about BAC.

I checked my pens by injecting into a water bottle cap (didn't want to waste a vial) and then sucked the expended water up with a insulin syringe. It was pretty much dead-on which surprised me from a cheap Ali pen.

 

[GimmeABreak]

Do you know the measurement uncertainty of your scale in the miligram measurement range? Also, I am not sure of the weight of BAC water with peps. Should a 10u volume weigh 10mg, I have no idea.

Confirmed with the Google that 1ml weighs 1mg. I am sure the science types around here knew this already, but I can now chalk it up to "today I learned".