Polygraph Pro
Original price was: €4,499.99.€3,499.99Current price is: €3,499.99.
Discount promotion until September 1, 2026
Professional Polygraph Intelligence Suite
Polygraph Box (incl. polygraph software)
GSR sensor (skin resistance)
Breathing sensor (belt)
BVP sensor (pulse)
BVP sensor (blood pressure)
BVP sensor (heart rate)
Temperature sensor
Support (setup & initial training)
For Windows operating systems
For beginners & polygraph examiners
Recommended accessories
Product
Description
Cost
Recommendation
Effect
Limited to
3D camera facial recognition
The 3D facial analysis using a 3D camera captures the finest facial movements and expressions during the examination and supplements the physiological measurement data. Examiners receive even more comprehensive details of the test process for the subsequent evaluation.
Cost
449,99€
White label own logo
White-label option for your professional brand presence. On request, we supply the polygraph with your own logo and branding so that the system integrates seamlessly into your corporate identity.
Cost
299,99€
Polygraph travel bag
The custom-fit carrying bag reliably protects your polygraph and all accessories against knocks, dust and damage – ideal for professional use on the go and for comfortable transport.
Cost
59,99€
AI evaluation – graphs
AI-supported graph evaluation. Our intelligent analysis supports examiners in evaluating the recorded polygraph data, recognizes relevant patterns in the measurement curves and clearly highlights conspicuous reactions.
Cost
189,99€
Why our Polygraph Pro is unbeatable
Polygraph Pro
Lafayette
Stoelting
Price
3.500€
7.000-8.500€*
6.000-8.000€*
Software included
fully
extra (license)
extra (license)
3D facial recognition
yes, optional
no
no
Training on operation & setup
included
extra cost
extra cost
Spare parts and service availability
yes
yes
yes
Intuitive software
yes
moderate
average
Professional use as an examiner
yes
yes
yes
*The prices and product information listed are based on publicly available sources and are intended solely for a general comparison. Due to individual offers, equipment variants and possible price changes, the actual prices and specifications of the respective manufacturers may differ.
'/></svg>)
Rated by customers on
Works as it was promised to me on phone! Highly appreciate your support. Enjoy your weekend and thank you. Best Wishes Jas
I didn't know that I could buy a professional lie detector in Europe without having to order it from the USA. I had researched for quite a while – and it's made in Germany. It arrived promptly. It's really worth the upgrade from my old lie detector device, which I once bought in America 20 years ago.
Can someone tell me how to install it? I called you, but I still don't understand it. Send me an e-mail at: liamdario@gmail.com.
I read an interview about an examiner who uses the polygraph from lie-detector.info, so I got interested about the product. I own a Praxis Psychological Services, PLLC since many years. Since there always has been a demand from my clients to take part in lie detector test with a polygraph, I made the decision to buy one. I was a little sceptical about the price. If you do a little research you find manufactors of polygraphs that are on the market over 20 years. The prices are at least $8.000 minimum and can easily go up to over $20.000. A real polygraph with 6 physiological sensors for $4000 only? I gave it a try! And all I can say it was perfect decision. The software is outstanding! Easy to use for novice users and with expert or advanced settings. Great invention! Superb polygraph. Thank you guys.
I bought the lie detector for my cabinet 3 weeks ago. It is as precise as my other 7k Euro equipment that I own. They even assisted me in order to set it up. I recomand it to anyone interested in having a professional lie detector.
I have bought the polygraph to measure physiological facts. The senors are good quality and the software is very sensitive. Results are awesome. Well, I can recommend it from my side. Would be interesting to have a statement from an educated examiner.
Your own polygraph vs. an on-site lie detector test
Mistake 1: Low intensity
"Professional polygraph testing agencies" are a dime a dozen, and not every polygraph examiner works ethically and makes the effort to find out the real truth through extensive repeated testing. It is often more about profit than about the test subjects.
To bring the truth to light with a probability of almost 98%, at least 5–10 test runs are needed.
Only those who repeat the test (including introductory questions and the actual questions) more than 5 times, rephrasing the questions each time and asking them again at a different point, can expect a truly well-founded and meaningful test result.
A professional polygraph test should take at least 3–4 hours instead of 30–60 minutes.
The more data is recorded, the more – and the more precisely – it can be analyzed. Accordingly, only after 10 lie detector test runs do you have enough values to evaluate the critical questions and answers. The answers from the multiple tests are compared on the graphs.
Conclusion: You can carry out a lie detector test privately yourself to find out the truth or a lie from the test subject. If you really take the time for more than 10 test runs, which examiners usually don't, even a private individual with their own polygraph can achieve a test result of almost 98%.
Mistake 2: Your own tests are more accurate
One-off polygraph sessions are of little use. Suspicion usually builds up over years, with one person accusing the other – or only suspecting them – of not telling the truth about certain things. Take a fidelity test as an example: often the cup has been running over for a long time. One partner can no longer fully trust the other.
In a relationship, it is advisable to test your partner for infidelity with a lie detector several times at intervals.
Suspicions often intensify over a long period of time, i.e. a suspicion of infidelity lasting years is often not resolved with a single fidelity test using a polygraph; it is better if trust can be restored through regular tests.
A healthy relationship over the years needs to be nurtured and cared for. Communication is the be-all and end-all. Nevertheless, we have accompanied countless couples with suspicions of cheating. For the other partner, there is nothing better than when the suspicion turns out to be unfounded.
Conclusion: You can carry out a lie detector test yourself to find out the truth or a lie from the test subject.
If you take your time several times without pressure, the result on the graph is usually considerably more accurate with "your own tests" than "on site".
3D camera facial recognition
There is no legal framework – anyone who owns a polygraph can offer commercial lie detector tests locally. The market is flooded with providers without psychological training. Without facial recognition and analysis of facial expressions and gestures, a result is only half as accurate, as these measurements are the cornerstone of valid data.
Precise questions
Questions must be standardized and clearly worded, otherwise the resulting curves are useless. A polygraph measures physiological reactions, not "lies". Comparing many test results is crucial so that the test is methodologically correct and the results are evaluated as objectively as possible.
Used by experts
Dr. Essam Nader, professional polygraph examiner, owner of www.luegendetektortest.net and www.treue-testen.com (11 years of experience), from Munich, has been using our polygraph in the Expert version incl. 3D camera for more than 8 years.
Based on 7-fold measurement
Lie detectors work with sensors that measure the body's reactions of the person being questioned and evaluate them with the help of a computer. The person connected to the lie detector is asked questions which they are supposed to answer truthfully. In the process, the heartbeat, breathing, the electrical conductivity of the skin and much more are measured.
Polygraph Pro
1. Data Box: All physiological sensors (measuring instruments) are connected to it.
2. GSR sensor: Measures human skin conductance/skin resistance with 2 electrodes – attached to 2 fingers. The sensor is very sensitive and returns values between 2,000 and 60,000. Very high-resolution measurement.
3. Temperature sensor: Measures the peripheral skin temperature with a resolution of 0.01 °C. As soon as the skin temperature drops, this is another indicator of activation of the sympathetic nervous system.
Polygraph Pro
4. Breathing sensor: A stretch sensor made of a silicone rubber band measures human abdominal breathing in terms of amplitude and breaths per minute, and how they change.
5. BVP sensor (pulse): BVP (Blood Volume Pressure) and IBI (inter-beat interval, increase in pace – measurement of pressure and stress)
6. BVP sensor (blood pressure): Dynamic relative blood pressure changes – measures extremely small changes in blood pressure that indicate fear, stress, pressure, fight or flight, etc.
Polygraph Pro
7. BVP sensor (heart rate): The HRV time-domain calculation (Heart Rate Variability) and the FFT spectrum analysis provide 40 different psychophysiological and physiological indicators of the mental and emotional state of the activity of the central autonomic nervous system.
8. USB cable: The USB cable connects the Data Box to the computer.
9. Operating system: Microsoft Windows
Accessories (optional)
3D laser camera: Facial diagnosis, facial recognition and changes in facial expression – the finest facial movements
White label – your own logo: Polygraph with your own logo and branding
Polygraph travel bag: Ideal for professional use on the go and for comfortable transport
AI graph evaluation: AI-supported graph evaluation. Our intelligent analysis supports examiners in evaluating the recorded polygraph data
OUR STORY
How our company came to be
lie-detector.info was founded with the aim of making professional polygraph technology more easily accessible in Europe as well. While high-quality systems could for a long time be obtained almost exclusively from the USA, there was no central point of contact offering advice in German, technical support and fast delivery times.
Today we offer modern polygraph systems, professional software and suitable accessories for users who value quality, reliability and competent support. From consultation and delivery to technical support, we accompany our customers personally and are there for them as a long-term contact.
POLYGRAPH EXAMINER DR. ESSAM NADER
Used by polygraph examiners
Dr. Essam Nader has many years of experience in the field of polygraphy and has been using our Polygraph Pro in his professional practice for 8 years. His trust in our solutions underlines our high standards of quality, precision and professional equipment.
Questions & answers
A polygraph (= “many writings”) or lie detector is a device that continuously and simultaneously measures and records the course of physical parameters such as pulse, breathing or the electrical conductivity of a person's skin during questioning.
Yes. The Polygraph Pro is compact, light (~2 kg) and can easily be set up, whether at home or when traveling – all it needs is a stable surface and a USB cable connection to a laptop or PC.
In principle, the lie detector can be used in any situation in which you need certainty about whether a statement is true. Whether as a fidelity test in a marriage or relationship, to solve a theft or simply as a party game – there are many possible uses.
More than 100 scientific studies on the accuracy of lie detector tests have been published. According to them, the accuracy of a properly conducted lie detector test is between 95% and 100%.
Being nervous before a lie detector test is nothing unusual. When the test is carried out professionally, nervousness cannot influence the result – lies certainly can.
Provided the person conducting the questioning is trained and qualified to carry out the test, this is very unlikely. The lie detector is a medical device that records changes in a person's autonomic reactivity while they are being questioned. If a person tries to control their behavior in order to falsify the result, this becomes obvious to a trained examiner when looking at the polygraph recording.
A complete polygraph test usually takes 3 to 4 hours. It begins with a detailed preliminary interview in which the facts of the case are discussed and the test questions are jointly defined and explained in detail. The polygraph examination is then carried out in several standardized measurement runs in order to create a reliable data basis for the subsequent evaluation.
The polygraph examiner then analyzes the recorded measurement data and discusses the results in detail with the person tested. A professional polygraph examination is not a short test, but a structured and scientifically established examination process that is carried out with the utmost care, precision and sufficient time.
Speak to a customer advisor or need help?
Submit the form – fast call-back within a few hours.
Frequently Asked Questions
You'll find questions & answers about our products, pre-orders and our service here.
Phone product consultation
Do you have questions about the product or delivery? We'll call you back by phone within a few hours.