The DUO1 tests gold and silver alloys, as well as platinum and palladium, with the SigmaBoss™ companion app on your bluetooth-enabled phone. Just place the coin or bar on the sensor, and tap "test"!
The tiny AG1 tests 1oz+ 999 silver without the need for a phone - the green LED lights when the conductivity's right!
see how they work
For all stackers
Never has a sigma machine been so affordable
For the silver lover
If you buy silver locally, the AG1 has your back
Go big
For when the dude says he wants a "second opinion"
Sigma machines induce and measure currents in your bars and coins with an oscillating magnetic field. Each metal alloy has a distinctive conductivity and fake precious metals will get caught! This measurement technique requires a solid mass of metal for the currents to circulate, and thus doesn't work on jewelry such as necklaces and bracelets.
For the DUO1 model, keeping the "brains" on your phone allows you to get updated metal signatures when we test new alloys, and allows us to provide a nice interface for a lower cost. And yes, the app is free - there's no charge for updates or any paywall for new services.
The AG1 model is self-contained, and has been pre-calibrated to only test against silver's conductivity value of 63MS/m. If the conductivity is right, the green LED lights up! Simple!
The market for sigma machines is fairly small - like, so small that enthusiast forums' group buy efforts to lower the price of the $1k+ professional machines have failed (less than 5 comitted buyers). So, we've done absolutely everything we can here to avoid typical expensive production techniques adapted to high volumes. That means avoiding injection molding, polycarbonate overlays, LCD screens, membrane switches, long manufacturing lead times in large batches, subcontracting warehousing...
So yeah, you're getting an acrylic case, but there's nothing wrong with the quality of the electronics inside. C'mon, look at the product photos; clearly we're on a budget - but so are you if you're reading this.
$9.99 flat rate shipping worldwide for all orders. Ships from within the EU.
Final prototypes for demo videos are presently being constructed. Both models will be available from late-October 2020 when the companion bluetooth app is uploaded to the app stores.
All hardware is guaranteed for 12 months against manufacturing and workmanship defects. As everything is manufactured using Just-In-Time techniques, if you're having a hardware problem or just want the latest firmware on your device, get in touch and we'll repair and have your device back to you quickly.
It's a sensitive analog instrument, and the electrical properties of the sensor are affected by a change in temperature. Like all sigma machines, your device should be maintained at a constant temperature - and this means you shouldn't keep it warm in your pocket and then expect it to return a consistent reading as it cools down to room temperature. If the temperature changes too much the device will ask you to recalibrate to the new ambient temperature.
The analog circuitry also expects at least 4.1V input voltage to avoid clipped waveworms - but don't worry; the battery light will not light if your batteries have been depleted below this voltage.