Hypodermic needles

[WM6]

After needle arrived will repeat such test with beer can ALU piece (5x5mm.. ⃞ ) too.

[Nupi]

Today I bought two new brands hypodermic needles.
And have a test done with hypodermic needles and with a piece of aluminum from a beer cans, 5 x 5 mm.

[Qiaozhi]

Have you the Disc on or off?

The Laser Hawkeye does not have a feature that gives different tones for ferrous and non-ferrous, so the test was done in All Metal Mode.

[Qiaozhi]

With sewing needles, it is difficult to compare, because we do not know the brand and whether it is the same alloy.
But in any case, many thanks for the effort.

I used pins (not needles) as these are smaller.

[sinclairuser]

needles used to be a problem on one of my beaches, till the needle exchange opened there locally, i dont know about elsewhere but here the ones given out by turning point exchange, are the green biodegradeable ones, (2 years for the pin, and 5 for the barrell.
when you find one, often the pin is just a stain in the sand, and the barrell is very opaque and brittle.
i have only detected the type that has separate large ends(the other half is a volunteer at an exchange and says druggies call these"steroid rockets"), the other type(insulin) have been in the spoil while digging valid targets.

[Nupi]

@ Qiaozhi

I've just done some tests with sewing needles for some comparison.


My results are these:


0,85 x 43,8 mm = 19 cm
0,75 x 39,7 mm = 18 cm
7,70 x 35,8 mm = 16,5 cm
0,6 x 30,5 mm = 10,5 cm


Detection was with Disc on and targets were all detect with the iron tone. (low tone)


Have you the Disc on or off?

[Nupi]

I don't have any hypodermic needles, so I tried some tests with ordinary pins used in sewing.
pin1: 2.5cm long, 0.59mm diameter ... no reaction
pin2: 2.6cm long, 0.65mm diameter ... detected at approx. 12.5mm (0.5")
pin3: 3.4cm long, 0.62mm diameter ... detected at approx. 50mm (2")
pin4: 5.0cm long, 0.78mm diameter ... detected at approx. 76mm (3")

The above are a representative example, although I did find that some smaller pins were more easily detected than certain larger ones. Which seems to indicate that the material composition plays a large part in the detection process.
The detector used in the tests was a Laser Hawkeye set to maximum sensitivity.

With sewing needles, it is difficult to compare, because we do not know the brand and whether it is the same alloy.
But in any case, many thanks for the effort.

[Qiaozhi]

I was this morning doing some tests with some needles with the Disc on and off.
I thought maybe some might find this also interesting, and I have made a short video of it.
The Blue Bayer needle is the same as in the photo and video.
The magnetic needle is shown in the picture # 3.


I would also know the opinion of Qiaozhi so far?

https://www.youtube.com/watch?v=XN0D...ature=youtu.be

I don't have any hypodermic needles, so I tried some tests with ordinary pins used in sewing.
pin1: 2.5cm long, 0.59mm diameter ... no reaction
pin2: 2.6cm long, 0.65mm diameter ... detected at approx. 12.5mm (0.5")
pin3: 3.4cm long, 0.62mm diameter ... detected at approx. 50mm (2")
pin4: 5.0cm long, 0.78mm diameter ... detected at approx. 76mm (3")

The above are a representative example, although I did find that some smaller pins were more easily detected than certain larger ones. Which seems to indicate that the material composition plays a large part in the detection process.
The detector used in the tests was a Laser Hawkeye set to maximum sensitivity.

[Nupi]

I was this morning doing some tests with some needles with the Disc on and off.
I thought maybe some might find this also interesting, and I have made a short video of it.
The Blue Bayer needle is the same as in the photo and video.
The magnetic needle is shown in the picture # 3.


I would also know the opinion of Qiaozhi so far?

https://www.youtube.com/watch?v=XN0DzwcHNoA&feature=youtu.be

[Nupi]

Yes, and the MD detected with a low tone. (iron tone detection)

[WM6]

Is your tested sewing pin #3 magnetic ( attracted by magnet)?

[Nupi]

I asked this morning my Pharmacist to other brands hypodermic needle but he had in the size 26Gx 1/2 "only Terumo.
He told me that if I could detect Terumo needles high probably can detect most brands disposable hypodermic needle.
They must comply the established standarts.
I will try this week to buy different brands hypodermic needle.
We will see.

[WM6]

Yes, it depend a lot of alloy used (your comparison between sewing pins #3 and #4 is very significant). Saying only stainless steel is not enough.

[Nupi]

@ MW6

I could not find the big hypodermic needle. But I have found two other hypodermic needles,
Which are also interesting #1 and #2.
The thickness of #1 is larger than that of # 2 but the detection distance is smaller!!!
So I think the alloy are different.

The most interesting needles are #3 and #4
as this is the first time that I have a needle that the MD can NOT detect #4. It is not a hypodermic needle but a
needle that I found in the sewing box from my wife.

[Nupi]

"Green.

I've been following both threads. I think of the responses that tried to detect the needles,
except for one response saying he could detect some reusable needles you are the only one that
has been able to detect them. Congratulations. Doesn't mean much but anything I've tried doesn't look
like it comes close.
Have you removed a needle and tried detecting just the needle? Hope to one day understand how you are doing it."

I'm not sure if I have understood correctly, but I have so far tested disposable needles, and I've tested separately.