How can I enjoy negative ions in my 280ft2 room?

We suggest you should install 2 units (of the Medical Ion Mini) as 1 unit covers up to 177ft2. It is great if you can install the ionizers/ion generators so that they are close to where human activity takes place.

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High-Density Ionizer/Negative Ion Generator - Medical Ion Mini with Ion Detector

Name: High-Density Ionizer/Negative Ion Generator - Medical Ion Mini with Ion Detector
Brand: Universal Plan
SKU: mi-1000-s-(en)
Price: 496.16 USD
Availability: InStock
Rating: 4.5 (469 reviews)

Covers a wide area for the best efficacy. Many positive feedback - Good sleep, Reduce cigarette smoke, Fatigue reduction!

The image of the tripod may differ from actual product.

with Ion DetectorUS$496.16 5 colors This page

without Ion DetectorUS$445.53 5 colors

Color Variations

Red

Negative ion performance is the same for both

withThe included Ion Detector shows you that it is working.

withoutAudible sparking sounds from the 3 ionizing needles let you know it is working.

P/N: MI-1000-S

US$496.16

FREE Shipping · No extra customs charges (local taxes excluded)

Payment: Credit/Debit card, PayPal

4.5469 reviews

Sales rank #1Widest coverage 16.5 m² (177 ft²)

In stock. Ship in 3 days

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Technical Supervisor & Quality Assurance

Masaharu Nemoto · Ion Trading (Universal Plan Co., Ltd.)

✓Made in Japan. With 30+ years verifying our products, I personally check the performance and technical details shown on this page.

Inquiry/Get a Quote

2-Year Warranty

We repair the product or replace it with a new one. All products are covered for two years.

Delivery by DHL/FedEx

US/SG 1-3 · Asia 1-5 · EU 2-5 · AU/NZ 2-5 · Others 2-6 days (just FYI)

Volume Discount · for orders of 3 or more pcs.

Countries Available for Shipping Payment Shipping & Delivery Import Taxes & Customs Duties

Product Summary

The patented technology, "Air Ionization Electron Emission Method" ^*1 generates a massive amount of negative ions while maximizing efficiency ^*2. This ensures that your room is filled with negative ions. This is why the Medical Ion Mini is highly appraised by customers. We guarantee the superior performance. There is no reason not to choose it!

*1 Int'l patent No. PCT/JP2002/008541 *2 Minimizes the loss and maximizes the ion count in the air

Outline specifications

Widest coverage	16.5 m² (177 ft²)
Negative ion generation method	Air Ionization Electron Emission Method (Pat No. PCT/JP2002/008541)
Negative ion count	Blow off point: 8,500,000 (pcs/cc)+ 1m (3.2ft) away: 270,000 (pcs/cc)+
Power	100-240VAC (50/60Hz) (comes with AC adaptor)
Positive ion count	Blow off point: 0 (pcs/cc)
Ozone production	0.001ppm or less
Ion Detector	Yes (Ion Detector model only)
Consumable parts	No
Dimensions	W140xH80xD40 (mm) / W5.5XH3.1XD1.5 (inches)
Weight	274g (9.6oz)

Play time: 0:47/No sound with subtitles

Customer Reviews

4.5 469 reviews

5 ★ 272

4 ★ 162

3 ★ 24

2 ★ 8

1 ★ 3

Mr. S.M Verified user

Tokyo, Japan

Reviewed on 2025-03-29

I also put one in my bedroom, and I really feel that the quality of my sleep has clearly improved.

Reason(s) why I purchased from you: I inquired by phone, and you answered my questions very clearly and politely, so I could trust you.
Detailed review: The effect of negative ions is wonderful, and I can definitely feel the freshness and clarity

Ms. M.K Verified user

Tokyo, Japan

Reviewed on 2025-04-20

I really feel that the air in my room has become very clean.

Reason(s) why I purchased from you: I have bought from you many times. The explanations are polite, delivery is fast, and the packaging of goods is careful, and so on.
Detailed review: This is my second Medical Ion. The first one is in my bedroom,

Ms. M.T Verified user

Osaka, Japan

Reviewed on 2026-03-15

I keep using it against cigarette smell. It has become something I cannot do without.

Reason(s) why I purchased from you: I trust you.
Detailed review: This is my fourth unit. The cigarette smell from my neighbor was so strong that I could not sleep. I even felt the cigarette smell in my own breath, and I thought this would shorten

Ms. C.M Verified user

Texas, United States

Reviewed on 2026-06-18

Does an excellent job of improving the air and leaves no traces of yuck.

Reason(s) why I purchased from you: I researched a good bit about ions and decided living in a massive city required me to clean up some of my personal breathing space. This product has fit the bill and then some. Does an excellent job of improving

Ms. M.S Verified user

Kanagawa, Japan

Reviewed on 2026-01-30

Comfortable even when kept on 24 hours a day. The air feels clear like a forest.

Reason(s) why I purchased from you: It is made in Japan, and I feel reassured because repairs are handled quickly.
Detailed review: I have an allergic constitution that is sensitive to pollen, PM2.5, mold, and so on. I also have a fan-type air

Ms. K.O Verified user

Kyoto, Japan

Reviewed on 2025-05-10

After using it, I certainly came to sleep well.

Reason(s) why I purchased from you: I looked at the product description on the online shop and thought it was a trustworthy product.
Detailed review: I happened to hear an advertisement for another company's negative ion generator. I understood its

See all 469 Customer Reviews Rating: 4.5

[Please note] These are individual impressions and do not guarantee the efficacy or performance of the product; results vary from person to person. If you require medical treatment, please consult a physician. Reviews of other products in the same series are also included. Reviewers may receive a small gift (a silicone bracelet) for posting a review; reviews are not selected or filtered based on their content, and only expressions that violate applicable laws or regulations may be edited, with the reviewer's understanding. Customer Reviews originally written in Japanese are translated into English by Ion Trading.

Customer Reviews

High-Density Ionizer/Negative Ion Generator - Medical Ion Mini with Ion Detector

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Wider Coverage - 2 advantages over other products

Negative ions need to reach you. Some products on the market generate negative ions but no ion molecule can be detected at a distance of 1m (3.2ft) away and/or ions can travel in one direction only. The Medical Ion Mini generates a massive amount of negative ions and covers a wide area for the best efficacy.

1. Massive Amount of Negative Ions

Generally, negative ion counts dramatically decrease as you go further away from the ionizer/ion generator.

More than 8,500,000 (pcs/cc) negative ions are detected at the blow off point of the Medical Ion Mini and approx. 270,000/5,000 (pcs/cc) are detected at 1/3m (3.2/9.8ft) away from the device. This means this model covers a wide area.

Distance from Ionizer/Negativ Ion Generator

*Measured at 25C/50% by a dual coaxial cylinder type air ion counter and a flat type air ion counter. **Figures vary depending on air purification levels and other ambient conditions.

2. Ions spread in every direction

There are ionizers/ion generators on the market which can disperse negative ions to the blow off direction only and a very few ions can be detected in other directions.

The Medical Ion Mini is designed to disperse negative ions to every direction to cover a wide area. 2000 (pcs/cc) can be detected at 2m (6.5ft) away in the 90 degree direction. You can enjoy negative ions!

Figures vary depending on air purification levels and other ambient conditions.

The amount of the negative ions, which the Medical Ion Mini produces, is too large to perform zero adjustment of the air ion couneter. You can refer to Secrets Behind the Development

3. The Tripod Helps Better Negative Ion Distribution

3-1. You can manually adjust the ion emission angle.

Rotate the blow off point to the upward direction for better negative ion distribution when located close to the floor.

3-2. It keeps a distance from the desk/table.

You may or may not know but a lot of negative ions released from the ionizer/generator are absorbed by the floor/wall. The body of the Medical Ion Mini is mounted on the tripod to maintain a certain distance from the installation surface. It is ideal that you install an ionizer/negative ion generator as far away as possible from the floor/wall.

Stable Performance - Less likely to be influenced by ambient conditions

Maintains optimum performance under extreme conditions

The Medical Ion Mini is designed to maintain optimum performance under high temperature, high humidity or low temperature, low humidity conditions. Many ionizers/ion generators on the market are susceptible to temperature and humidity changes.

User Friendly

1. Easy Maintenance

You just clean the ionizing needles with a swab when they become dirty.

Caution: Be sure it is unplugged before you clean the needles.

2. Ion Detector for Test Operation (Ion Detector model only)

The Ion Detector that comes with this product enables you to make sure that the ionizer/negative ion generator does generate negative ions. You cannot tell if your ionizer/negative ion generator is working properly without this detector because you cannot see ions with the naked eye.

How can I check if the device is working without the Ion Detector?: If audible sparking sounds are released from the 3 ionizing needles located on the front cover, it is generating ions.

3. No Wind Noise

No noise is generated because it does not have a built-in fan. Great for your bedroom!

4. Lightweight & Compact Design

You can take it with you wherever you go thanks to its lightweight (274g/9.6oz) and compact design.

5. Low Power Consumption

Its power consumption is only 4W or less.

Life Span - Ionizing needles ensure 5 years+ life span

Ionizing needles ensure 5 years+ life span

The ionizing needles emit negative ions and determine the life span of the Medical Ion Mini. Worn-out needles can lower the performance.

Our ionizing needles are made of ultra pure tungsten (99.999%) and ensure 5 years+ life span.

You can continue to use it after the life span of 5 years if negative ions can be detected by the Ion Detector.

Ionizing needles

Safety to Humans

1. Very little ozone

In contrast to electric discharge type ionizers/negative ion generators, the Medical Ion Mini is designed to minimize ozone production.

Ozone density < 0.001ppm

* IEC standard 32-1 of J60335-2-65 Measured at 25C/50% * Ozone concentration after 24 hour operation in a 7.425m² room (Japan Quality Assurance Organization)

2. No positive ion

The Medical Ion Mini produces no positive ion that could not only be detrimental to negative ion production but also could be harmful to the human body.

* Measured at 25C/50% by a flat type ion counter and our measurement method

3. Nominal electromagnetic radiation

This ionizer/negative ion generator emits very little electromagnetic radiation meeting the safety standard.

Efficacy Result

Many users say that they

have a good sleep
feel fresh air
wake up refreshed
less likely to get tired
chronic migraine has gone
etc.

Doctor's Comment

Stress alleviation effects by the Ion House ^*3

*3 The Ion House was used to conduct this experiment. The Medical Ion Mini will produce a similar result as it has the same negative ion generation method as the now discontinued Ion House.

Dr. Ichiro Watabe, Assistant Professor of Hokkaido University Hospital
Rehabilitation Department ^*4

*4 Currently Professor of Aomori University of Health and Welfare

While further research is required to fully understand how negative air ions work on the human body, beneficial effects on health have medically been found.

We used an ionizer/negative ion generator designed by Daito to conduct this experiment. We did a double-blind test to observe 1-3 under light load conditions such as immersing in cold water and doing a simple calculation.

The sympathetic nerve function which has an effect on the skin temperature (peripheral blood flow)
Stress hormone
Stress immune reaction

As a conclusion, the skin temperature (peripheral blood flow) significantly improves, the cortisol value which shows the endocrinological hormone balance significantly decreases and the number of NK cells which shows the immunological stress index significantly decreases.

It is understood that negative ions generated by the ionizer/ion generator help to ease the sympathetic nerve functional acceleration and stress is hormonally/immunology alleviated.

Q & A

1. What is the difference between the Medical Ion Mini and other ionizers/negative ion generators?

Negative ions are dispersed to every direction.

Many ionizers/negative ion generators found in the market disperse negative ions to one direction only and very few negative ions can be detected in other directions. i.e. Negative ions do not reach you.

This means not only you cannot enjoy negative ion effects but also your ionizer/ion generator just wastes electricity.

For example, if you have a heater and only the air around it can be warmed, you will look for a new heater which can distribute the hot air throughout the room. The same goes with ionizers/negative ion generators. Negative ions have to be distributed throughout the room to enjoy negative ion effects. It is often overlooked and little information can be found but it is one of the most important things to remember when you purchase an ionizer/negative ion generator.

2. How long is the life span?

Ionizing needles ensure 5 years+ life span. The ionizing needles emit negative ions and determine the life span of the Medical Ion Mini. Worn-out needles can lower the performance. Our ionizing needles are made of ultra pure tungsten (99.999%) and ensure 5 years+ life span.

3. Does it really work on the human body?

We cannot guarantee that the Medical Ion Mini will work on you because it is not a medical instrument. It depends on your ambient conditions and many other factors. However, we have received a lot of positive feedback from satisfied customers. You can refer to the testimonials.

4. Do I need to purchase any consumables on a regular basis?

No, you do not.

5. How can I take care of it?

You only need to clean the ionizing needles from time to time. Gently wipe the tips of the 3 ionizing needles with a cotton swab. If the ionizing needles get dirty, the amount of negative ions generated may decrease, so we recommend cleaning them regularly.

6. How often do I have to clean ionizing needles?

We suggest once every 3-4 months.

7. How much ozone does it produce?

It produces 0.001ppm or less, which is less than 1/100 of the safety standard established by the Ministry of Health, Labour and Welfare. No worries at all!

8. Does it consume a lot of electricity?

Its power consumption is only 4W or less.

9. Where should I install it?

It should be located at least 100/30cm (3.2/1.0ft) away from the floor/wall to ensure the maximum performance. This is because negative ions can be absorbed by the floor/wall.

10. Can I continue to use it after the life span of 5 years?

Yes, you can if negative ions can be detected by the Ion Detector. If not detected, you need to send us the Medical Ion Mini for replacement of the worn-out ionizing needles.

11. Can you tell me about the replacement work for worn-out ionizing needles?

We can replace the needles at approx. US$60 including shipping. Shipping your Medical Ion Mini to us is at your own expense. Please contact us when replacement work is needed. We complete the replacement work and ship to you within 3 days of receipt of the Medical Ion Mini.

12. The Medical Ion Mini generates more negative ions than other ionizers/ion generators on the market. Doesn't it have a negative effect on the human body?

No study suggests that a large amount of negative ions have a negative impact on the human body.

13. How does it work in a smaller room than 16.5m² (177 ft²)?

You can enjoy the highly concentrated negative ion density in a smaller room. This is why we recommend the Medical Ion Mini even if your room is smaller than 16.50m² (177 ft²).

14. How can I enjoy negative ions in my 280ft² room?

We suggest you should install 2 units (of the Medical Ion Mini) as 1 unit covers up to 177ft². It is great if you can install the ionizers/ion generators so that they are close to where human activity takes place.

15. Is it OK to install this ionizer/ion generator without using the tripod?

We suggest you should mount it on the tripod whenever possible. This is because the negative ions can be absorbed by the table/floor/desk where the device is placed. i.e. The tripod included in the package is designed to keep a certain distance between the negative ion blow off point and the installation surface.

16. Can I use this ionizer/ion generator in my country? I think the voltage and AC plug are different from Japan.

You can use the Medical Ion Mini in most countries as it works with AC100-240V and comes with the AC plug adaptors for the countries.

17. Can I turn it on 24/7?

Yes, you can.

Specifications

P/N	MI-1000-S
Product name	High-Density Ionizer/Negative Ion Generator - Medical Ion Mini with Ion Detector
Negative ion generation method	Air Ionization Electron Emission Method (Pat No. PCT/JP2002/008541)
Material of radiation needle	Virgin tungsten (99.999%)
Widest coverage	16.5 m² (177 ft²) ^*5
Weight	Approx.274g (9.6oz)
Power	100-240VAC (50/60Hz)
Consumption power	4W or less
Dimensions	W140xH80xD40 (mm) / W5.5XH3.1XD1.5 (inches)
Negative ion count (pcs/cc)	Blow off point: 8,500,000+^6 1m (3.2ft) away: 270,000+^7
Positive ion count (pcs/cc)	Blow off point: 0^*7
Output voltage	DC -9.5kV
Ozone production	0.001ppm or less^*8
Accessories	·110/240VAC compatible AC adaptor ·Ion Detector for test operation (Ion Detector model only) ·Dry batteries for Ion Detector ·Tripod
Made in	Japan
Limited Warranty	2 years from the date of purchase

*5 Varies depending on the structure of the room, nearby electronic appliances, purification level of air, etc.
*6 Room temperature 23C, Humidity 30% R.H. Measured by a double coaxial cylinder type ion counter and our measurement method.
*7 Room temperature 23C, Humidity 30% R.H. Measured by a flat type ion counter and our measurement method.
*8 • IEC standard 32-1 of J60335-2-65 • measured at: 25C, 50% R.H. in a 7.45m² (80 ft²) box after 24 hours running. (JAPAN QUALITY ASSURANCE ORGANIZATION)