Gold Coin Testing Machine - Conductivity Tester for Gold Coins, Bars and Bullion

Gold Coin Testing Machine

Tells you whether a gold coin or bar is what it claims to be, without opening the capsule or marking the metal.

Someone puts a sealed one-ounce coin on your counter. The capsule carries part of its value, so you cannot open it, and acid would ruin the piece anyway. This instrument reads the metal through the capsule. You tell it what the coin is supposed to be, rest it on the measuring face, and the conductivity comes up on screen next to the value that alloy should give. A tungsten-filled fake cannot match that number, because tungsten carries current less than half as well as gold.

How It Works

The instrument puts a small magnetic field into the piece. That field stirs eddy currents in the metal, and how freely those currents flow depends on what the metal actually is. The reading is shown as electrical conductivity, in MS/m. Fine gold sits near 45 MS/m. Silver sits near 61. Tungsten, the metal used to fill counterfeit bars, sits near 18.8. A piece that does not read where its alloy should read is the warning.

How to Use It

1. Set what the piece claims to be - the metal and its fineness, so the instrument knows the value to expect.
2. Rest it on the metal. Lay the coin or bar flat on the measuring field, or rest the pen tip flat against the surface. No pressing down.
3. Read the number - the conductivity in MS/m, against the expected value for that alloy.

Sensor Pad or Pen

What It Protects You From

What It Will Not Tell You

• No karat number. It reports conductivity and whether that matches the alloy you selected. For a karat reading, use the Portable XRF Gold Analyzer.
• It reads about 0.65 to 0.7 mm into the metal. A thick gold shell over a foreign core can sit deeper than that, which is why the maker says to pair it with a second method on high-value pieces.
• Very small and finely detailed pieces may not give a clean reading, and coins below about 1/4 oz are outside the sensor pad's range.
• Iron and steel are flagged, not graded. A ferromagnetic piece shows as ferromagnetic rather than being given a value.
• Readings drift with temperature. The maker specifies room temperature, about 22 °C.

What You Can Test

Gold coins and small gold bars, including bullion still in capsules and blister packs. Silver coins and bars, and silver cutlery on the pen. Platinum and palladium pieces read on the same conductivity scale. It is built for bullion shapes - flat, regular pieces with a clean face - rather than for jewellery with stones set into it.

Key Specifications

Who Uses It

• Bullion dealers checking coins and bars before paying for them
• Gold buyers and cash-for-gold counters screening coins that come over the counter
• Pawnbrokers and gold loan branches checking collateral before lending against it
• Banks and vaults spot-checking stored bullion without breaking a single capsule
• Coin dealers and collectors testing graded coins without opening the holder
• Field buyers and appraisers working away from a fixed counter

Common Questions

Will it damage the coin?

No. Nothing touches the piece except the sensor face, and there is no acid, no filing and no scratching. A graded or collectible coin keeps its surface, its grade and its premium.

Does it tell me the karat?

No, and that is worth being clear about. It reports electrical conductivity in MS/m and whether that matches the alloy you told it to expect. If you need a karat figure and a metal-by-metal breakdown, that is the Portable XRF Gold Analyzer.

Can it really catch a tungsten-filled bar?

That is the case it was built for. Tungsten conducts at about 18.8 MS/m and fine gold at about 45, so a tungsten core drags the reading far away from where gold should sit. Weighing the piece will not find it, because tungsten and gold weigh almost the same - which is exactly why counterfeiters use it.

Can I test a coin that is still in its capsule?

Yes, through capsules, blisters and foil up to about 3 mm. Sealed and graded bullion can be checked without breaking the seal, so the packaging and the premium attached to it survive the test.

What size coins and bars does it take?

On the sensor pad, coins from about 1/4 oz and bars from 10 g, up to roughly 2 oz or 50 g, with thickness the limiting factor at the top end. The pen handles coins and small bars up to about 1 oz and copes with irregular shapes.

What does a reading of 45 MS/m mean?

That is about where fine gold, 999, should read. The instrument shows your reading next to the expected value for the alloy you selected, so you are comparing two numbers rather than interpreting one. A fluctuation of about ±0.3 MS/m is normal.

How is this different from the XRF analyzer?

They answer different questions. The XRF analyzer reads the karat of the metal it is aimed at. This one tells you whether a piece conducts the way that alloy should, works through sealed packaging, and runs on a battery. There is also a difference in what each can see: X-rays read only the top few microns of a surface, so a tungsten core under a thick gold shell is invisible to any XRF, while conductivity reaches through to the metal underneath. Counters handling both bullion and jewellery keep both - this one for screening coins and bars, an XRF analyzer for karat on jewellery and scrap.

Does it work on silver and platinum?

Yes. Silver 999 reads near 61 MS/m and platinum 999 near 9.1, and palladium reads on the same scale. Silver cutlery is one of the things the pen is used for.

Does it need calibrating?

It arrives calibrated, so you can test from the first day. A copper calibration piece is supplied, and you use it whenever you want to confirm the instrument is still reading true.

How long does the battery last?

Over 10 hours of active use on a full charge, and about 2 hours to charge. That covers a buying day, a vault audit or a day at an exhibition.

What happens if the piece has iron in it?

It shows "Ferromagnetic" instead of a conductivity value. Iron and steel disturb the magnetic field the measurement depends on, so the instrument tells you that rather than giving you a number you should not trust.

Is one reading enough on a high-value piece?

For a quick screen at the counter, yes. On something valuable, the maker's own advice is to back it with a second method, because the measurement reaches about 0.65 to 0.7 mm into the metal and a deep core can sit below that. Screen with this, confirm with XRF.

Pricing, Installation & Support

Price is quoted per configuration, because the sensor pad and the pen suit different pieces and we would rather send you the one that fits what you actually test. Send us a WhatsApp message describing what comes across your counter - coins, small bars, sealed bullion, cutlery - and we will quote the right one. Operator training on reading the scale is included, and we stock the other gold testing machines if you need a karat figure alongside this. Service across 16+ Indian cities. EMI options are available through partner banks.

Sales: WhatsApp +91 98216 12340 | Wholesale: WhatsApp +91 80823 38010

Semsons Tech - Where Quality Speaks For Us. Since 1978.