Sigma Metalytics PMV Pro

The precious metals testing kit PMV PRO allows you to analyze the electrical properties on the surface of the sample, all the way through the sample and it is also possible to do a specific grafity test directly on the screen by using the sample weight.

  • Quick and easy to use, result in less than second!
  • Detects and prevents precious metal fraud
  • Can be used with any metal
  • Testing without chemicals or damaging the sample
  • Reads the metal bulk—not coatings and plating
  • Testing through plastic cases and bags
  • Specific gravity testing
  • Easy to program for additional sample types
  • Color display
  • No maintenance required
  • Long battery life
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Requires at least 30 confirmations
Only 999/1000 gold is accepted

The PMV PRO verifier can make four different measurements to verify whether the coin or bar contains the metal that is expected

Like the Original PMV, all PMV PRO sensors can test the surface electrical properties of the sample. Even this analysis penetrates deep enough to reveal heavy plating.

Using two bridge sensors, PMV PRO can measure the resistance through the entire sample and determine if it is the same as on the surface. In this way it can detect inserted metals and a fake core. Bridge sensors can also measure the thickness of the sample, even through plastic packaging and cases.

After entering the weight and measuring the thickness, you can determine whether the density (specific gravity) of the sample is consistent with the selected metal. Directly on the screen, it is possible to test whether the length / width or sample diameter corresponds to weight, resistance, metal type, and sample thickness.

Large bridge sensor (left) measures samples with a diameter of 30 mm or more. The maximum thickness that can be used on this sensor is 14 mm. The small bridge sensor measures samples with a diameter of at least 8 mm. The maximum thickness that can be used is 4.2 mm.

The Refiners Wand allows for measurements of surface resistivity (like the original PMV) for bars thicker than 14 mm. It measures 50% deeper than the Bullion wand that comes with the original PMV. The Microwand can measure items as small as 3 mm.

PMV PRO already contains a number of standard metals and alloys such as pure gold, 22K gold with copper (Krugerrand), 22K gold 3% silver 5.3% copper (American Gold Eagle), 98.6% gold (ducate gold) and 90% gold with copper, pure silver, coin silver, 90% silver, older 90% silver, 80% silver and Britannia silver, platinum, palladium, rhodium and copper. You can add custom metals and alloys via your computer.

Dimensions 28.0 × 20.5 × 6.5 cm
Weight 750 g
Measuring range of samples no limit
SensorMin. Sample ThicknessMin. Sample Diameter
Small Bridge Sensor 0.6 mm 28 mm
Large Bridge Sensor 1.5 mm 10 mm
Microwand 0.3 mm 3.5 mm
Refiners Wand 1 mm 24 mm

Package

  • PMV Pro
  • USB charger
  • case
  • User Guide

PMV PRO

Measurement display explained

Entering metal and weight values

Working with silver bars

Working with blister packs

Working with numismatic cases

Working with small samples

Working with questionable samples

Fake samples demonstrated

Calibration

Frequently Asked Questions

How does the PMV work?

The Verifier works by analyzing the resistivity of the metal sample. Resistivity of various metals is very different and even small variations in alloying results in different resistivity. Conductivity value for base metals are well known and can be found on Wikipedia and other web sites.

How do I use PMV?

PMV usage is very simple. Power unit on, wait for calibration to finish, select metal you would like to test and place the sample on sensor or place external wand over the sample. Resistivity reading takes just seconds. Each unit comes with User Guide and there are several videos available with instructions.

How do I know which sensor to use?

The small wands are for reading very thin and small samples, for example 1/10 oz coins, 1 gram bars, and CombiBars. Some slabs have high walls which make it difficult for the main sensor to reach far enough to get a reading. The large wand can sit on the flat part of the slab and often measure coins that the main sensor cannot. The large wand is also useful for rapidly reading coins in albums or cases without removing the coins. Accurate measurement requires that the sample must completely cover the sensor. The higher the resistivity of the metal, the deeper the signal penetrates.

How and when is the unit calibrated?

The unit is calibrated whenever the metal is changed, when the unit is turned on, if the sensor is changed, or on command by the user. Usually recalibration is unnecessary. However, if odd readings are obtained (typically coins that are thought to be good are reading out of range), one thing the user should do is recalibrate to make sure the instrument is giving correct readings.

Does it need maintenance or consumables?

No. PMV does calibration internally, and has nothing that is consumed. All you need is to charge the battery.

Can the wrong metal give an answer that looks right?

It is almost impossible to duplicate another coin's resistivity, weight, and size. For example, silver is the most conductive metal known, so it is virtually impossible to duplicate. Gold is the third most conductive metal (only copper is between them). Platinum and Palladium have almost identical conductivities but are easy to distinguish in other ways.
In principle it would be possible for an alloy to be developed that would mimic, for example, American Eagle gold. But combined with the appearance and weight of the coin, the fake would be obvious. A coin that has about the right weight (for example using tungsten to fake gold) would have a totally different resistivity than gold.

Can the right metal give an answer that looks wrong?

The results of the Verifier measurement are affected by the coin temperature, the coin stamping relief, and by the coin alloy. Temperature is compensated for in the instrument and is a fairly small effect, so except under very unusual circumstances will not be a factor. Only when the sample has been left in a hot car or out in the cold will it typically come into play. Generally, a hot coin (hotter than the instrument) will read to the right a little bit, and a cold sample will read a bit to the left.
Coin stamping relief is easy to see on the coin. The PMV already assumes a typical stamping relief and the effect is typically small. However, some medallions and molded coins have extreme relief and will read a little bit to the right. This is not typically seen in conventional coins because the relief is too small. On bars, areas that have heavy embossing or bubbles and flaws will sometimes read slightly to the right. Usually reading the opposite side or in another location will remedy this effect.

Can the PMV be used with jewelry?

The PMV does not work well with jewelry for two reasons. First, we need to know the specific alloy we are measuring and then determine is the item being tested falls into the range of that alloy. Jewelry alloys vary considerably. Each different combination would have its own range. The number of variations is too great to be included in default database. The second problem is that we need a flat area of metal that can be completely covered by the sensor. Jewelry is often curved, woven, and/or ornate in a fashion that makes it so we cannot get an accurate reading on it. Also, necklaces, rings, and earrings are usually too small for even our small sensor to get an accurate reading. We have some success looking at sterling silver flatware and it often matches up with the sterling silver range on the PMV, but there are also pieces that we just cannot measure.

How do I recharge the battery?

The battery is a standard lithium-ion battery. You can use the charger and cable that come with the unit. You can also charge the unit from another mobile phone charger, the USB connector from a computer, the USB connector in your car, or the USB connection on an power outlet.

Is the PMV safe to use?

Yes, the PMV uses very low power, low energy signals and doesn't emit any dangerous radiation.

Can new types of metals be added?

Yes, with the PC program you can add new types of samples, name them, and download them into the PMV for use. Contact us and we will assist you with this process.

What is the difference between the two bars on the display?

The top bar measures just the surface of the bar a fraction of a mm deep. Even so, this is deep enough to look under hundreds of plating thicknesses. The bottom bar is the thru measurement that goes completely through the sample and can detect any deeply buried counterfeit metals.

How can the PMV PRO measure the density of the bar?

The user selects the metal type and enters the weight of the sample. As we can measure the thickness of the sample, we can then show an image on the display to match what the diameter, or rectangular shape should be. If the sample does not match this defined shape displayed on the screen, then it must be an incorrect density.

What does the number next to the displayed image mean?

The number on the display is the characteristic resistance (resistivity) in micro-ohm per cm. This number can be found on Wikipedia for base metals and other web sites. Using the setup screen on the unit we can change the display to show the number is a different manner, characteristic conductance (conductivity), in micro-Siemens per cm.

Looking for something smaller?

Original PMV offers the same technology at a lower price, making it an ideal for all numismatics collectors and small investors in precious metals.

Original PMV

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