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Your cart is empty.Cassandra
2025-09-06 09:20:26
Bought in October 2024. And worked a few months with occasional use, but noticed a few times while in the middle of testing a gem, the machine would turn off. I flipped it on and off and it turned back on, but it just happened again, and will not turn on or beep at all. I tried putting batteries in, tried different outlets and will not turn on.
JB
2025-07-22 17:39:29
It narrows the field down a tad. I use it mostly to check to see if stones I purchase are even remotely what they were said to be. For the stones that I buy this works fairly well. Like many others review have said, this can not be the only testing you do to identify a stone. But if you 90-95% sure of the stone and just want to have that extra 5-10% for peace of mind than this works pretty well.
Timothy M. Sparrow
2025-07-13 14:27:04
Bought this for my wife. We rockhunt. She also test jewelry with it. She has a smaller less expensive tester too. likes this one much better. Seems to be accurate, it's easy to use. It may not be something a pro jeweler would want,( i don't know). But for the layperson. 2 thumbs up.
Steven
2025-07-11 11:16:59
But it was sometimes dead on and off on other times with known stones. I wish the accuracy would have been better if so this would be a great tool to have.
richard
2025-05-27 11:01:24
Straight out of the box the indicator or needle never moved, China has to do better! This was over 400 bucks! So this week after returning the first one, I bought another and low and behold, same issues the needle won't move so disgusted I called Singapore and they said we'll call you back within 30 minutes. Guess what, no call back so this is the second duo tester I've returned. Don't buy from this company. Some things may work but the 2 i bought didn't, and no support afterwards.
Carol A Rochelle
2025-04-02 17:35:27
I am a beginner working with gems. When I received this tester I took it to my teacher and we opened it together. ( He himself has this tester and recommended to me) He commented to me the pen did not have a cover over the needle when opening the tester. He commented that there were scratches in the lower right corner under the name. At that time he coupled the pen to the tester and said it was not a tight connection it came out very easily. Then plugged the tester in and told me it was not working properly. He show me how his tester worked on a diamond, then mine and it would only register topaz. After several other attempts on other gems he advised me to return it. He said the tester could have been a somebody's return or a lemon from the factory. I hope this helps anyone who's looking to purchase.
Capri Parry
2025-03-22 11:53:26
This works very well...give it a few reading and it settles into correct calibration. I couldn't be more pleased.
NSC Shopper
2025-03-03 13:33:28
So yeah, after reading the reviews I figured it was a crap shoot whether I get a working on or not. Well, no luck for me, as mine wouldn't calibrate. The meter would get "stuck" at certain points which makes it worthless to try and measure stones with. Oddly, the RI reading didn't seem to provide accurate readings either. These issues probably has to do with the packaging that's used for the machine. The device has NO shipping padding and only comes with a nylon case that's ok for lite travel, but would absorb ZERO bumps or impacts during shipping. The testing wand didn't come wrapped in any kind of bag... weird. The probe was exposed; when it really should have some type of cap on it (you know, like pens do...) for extra protection. The manufacturer's cheap and careless packaging is giving a probably really decent tool a very bad name!
Hector Rodriguez
2025-02-16 16:50:26
Estoy medianamente satisfecho con esta compra. Al principio pensaba en regresarlo porque la calibración parecÃa no funcionar, la aguja nunca llegaba a "cal", pero las gemas sà las identificaba correctamente. Después de unos dÃas, la calibración funcionó a la perfección, quizá necesitaba reposar por el transporte. Detecta correctamente todo lo que he probado: diamantes, zafiros, rubÃes, aguamarinas, granates, turmalinas, cuarzos, jadeita y nefrita, granates... Incluso me llevé algunas sorpresas tanto buenas como malas al saber qué eran algunas gemas de las cuales no estaba seguro. Le quito una estrella porque la función de refracción es muy quisquillosa, la gema debe estar extremadamente bien pulida y sin ningún rayón o polvo para que de resultados exactos, de lo contrario no sirve con muchas gemas facetadas que probé. Pero decidà quedármelo porque sà me es de utilidad la función de conductividad eléctrica, y la de refracción la uso cuando tengo una gema muy bien pulida para comprobar que al menos se acerque al valor esperado.
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