Transcutaneous Electrical Nerve Stimulation (TENS) at Acupuncture Points - Why not?

TENS and acupuncture/Acupressure do not have the same origin in the development process. In the "TENS and Acupuncture: Understand the Relevance" article, I have a general overview of this issue.
The question is: 
Can TENS apply at acupuncture points?
Which research papers are about applying TENS at acupuncture points effectively?
The results and research materials of reliable websites such as Webmd, wikipedia, NCBI, etc. are worthy of consideration. However, reporting materials cannot avoid neutral reviews (for some reason, they only report neutrally).
Therefore, I will take the survey results at reputable websites, combined with user trends.

Research on TENS applied in acupuncture points. What do they say?

1. TENS applies Acupuncture theory

Acupuncture is a popular treatment for pain management, but as a time consuming treatment with only temporary effects, has efficiency implications for NHS services. The potential to use TENS over acupuncture points as a non-invasive alternative stimulation, suitable for self-application, has been suggested yet received limited attention in the published research.

Transcutaneous electrical nerve stimulation (TENS) at acupuncture points for the management of chronic pain: a narrative review:

Purpose: This review explores the physiological mechanisms supporting this treatment modality, the clinical efficacy of acupuncture and TENS and the clinical evidence for TENS applied to acupuncture points in order to assess the potential for clinical use and how it should be applied.
Methods/analysis: A literature search was conducted using Medline, EMBASE, CINAHL, AMED and the Cochrane Database for work relating to the physiological mechanisms and clinical effectiveness of acupuncture, TENS and TENS applied to acupuncture points. Details of the reported physiological mechanisms relating to all modalities were extracted and compiled to produce a narrative synthesis of the similarities and differences. Data was extracted from the clinical evidence relating to the treatment dose parameters including frequency, intensity, treatment duration and stimulation location in order to identify themes and patterns, which was used to produce a narrative analysis and review. The quality of clinical evidence was assessed using the PRISMA checklist for systematic reviews and the Downs & Black tool for clinical trials.
Results: Despite similar physiological mechanisms, acupuncture and TENS are often applied with different treatment protocols and their clinical efficacy has been conflicting in the literature. The existing clinical evidence for TENS applied over acupuncture points for chronic pain has generally positive outcomes but is of low quality. Inadequate or excessive treatment duration may be a factor in the efficacy of acupuncture, TENS and TENS applied to acupuncture points for chronic pain. All three may perform best when used for the same optimal treatment durations.
Discussion and conclusions: Applying TENS in the same typical treatment protocol used in acupuncture treatments may be as effective as invasive acupuncture in managing chronic pain. A good quality clinical trial is required to verify the findings of this review.
Impact and implications: The results of this review have implications for the current guidelines on the application of TENS machines and identifies a potential method of maintaining the effects of acupuncture for the long-term in chronic pain patients, thus reducing the demand on NHS services and promoting self-management.

Source: https://www.physiotherapyjournal.com/article/S0031-9406(16)30164-X/fulltext

2. TENS applied according to Acupressure/Reflexology 

The term Acu-TENS used to describe TENS applies the method of acupressure therapy. Acu-TENS is not a coincidence.
And this is research: Acu-TENS and Postexercise Expiratory Flow Volume in Healthy Subjects

Conclusion
Contrary to Placebo-TENS, our findings showed a statistically significant enhancement of postexercise FEV1 and prolongation of sub-maximal exercise duration after administration of Acu-TENS in subjects with normal health. In other words, Acu-TENS, a noninvasive modality, is able to attenuate the drop in FEV1 and enhance the respiratory response to exercise. Our study suggests that Acu-TENS has the potential to improve the postexercise FEV1 and may have a role in extending the duration of exercise training.

Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3038691/


Note: Acu stands and signs for Acupuncture and Acupressure.
This means Acu-TENS is understood as TENS, which applies Acupuncture and Acupressure

The trend of the era of TENS applies to the theory of Acupuncture | TENS at acupuncture points

1. Science and investors for Acu-TENS

If the Acu-TENS reports are neutral, then investors have decided to cooperate with science, with the aim of inventing Acu-TENS. Perhaps investors have had separate research results. Because they dare to pour money into producing Acu-TENS. They are not afraid of neutral reports.

This is a video about Acu-TENS - the trend of the times - the popularity:

To know the growth of Acu-TENS, you can visit the market selling Acu-TENS: Acu-TENS sale market

I will not introduce Acu-TENS on Amazon. Because for this item, China - the birthplace of Acupuncture Medicine - is a strength of Acu-TENS. Items on TENS on Amazon have a lot of origin from China.
Why is this possible?
In fact, Amazon plays like a big market, or like a trading floor. So Amazon accepted the "Drop Shiping" form. The Drop Shiping players edit photos and information from the Chinese market, sell on Amazon, the price is very expensive, usually double.

2. Other variations of TENS

Acu-TENS is a variant of TENS, based on acupuncture theory that develops.

In addition, TENS has many other variations, known as EMS and CES

EMS impact targeting is muscle and tissue

CES is like TENS, targeting the nerves. But CES acts on the head.

Learn about EMS and TENS here: TENS vs. EMS: Understand the Difference

Learn about CES: Cranial Electrotherapy Stimulation - Deep overview

Video of CES activities: 

The video talks about the scientific basis - how CES works - a variant of TENS.

Should Acu-TENS be used? And which one to choose?

First of all, need to compare: TENS and acupuncture, which one is better?

TENS: Subcutaneous nerve irritation with electrical impulses

Acupuncture: nerve stimulation under the skin (Subcutaneous nerve irritation) + affects all three treasures as a health foundation is Jing-Qi-Shen.

Clearly, in terms of quantity, Acupuncture is stronger than TENS. However, in terms of quality, it is necessary to have a good and professional doctor.

Acu-TENS is a combination of acupuncture, reflexology with TENS. So it works more strongly than classic TENS.

TENS is popularly sold in the market, used as a relaxing and entertaining tool. Acu-TENS has features of TENS. So why not?

So you can use Acu-TENS instead of classic TENS.

Because of the difference of Acu-TENS, it is necessary to have a guide to accurately identify acupuncture points. This is the document: additional documents for Acu-TENS

If you want to buy Acu-TENS, TENS in conjunction with EMS, with cheap, good prices, this is the market for you to buy:

• Market TENS - EMS
• Market Acu-TENS
• Market CES