Mitsubishi pencils have been developed for 100 years, and although they are called "Mitsubishi", they have nothing to do with the Mitsubishi Group, which manufactures mechanical and electrical products. Historically, Mitsubishi Pencil was the first company to use the Mitsubishi logo, and since it did not compete with the Mitsubishi Group, the two sides allowed each other to use the Mitsubishi trademark.
 
Mitsubishi is the world's leader in the field of gel pens, and is also the first manufacturer to successfully develop and produce rollerball pens, and has developed many of the most in the market: the thinnest gel pen, the thickest gel pen, the only ballpoint pen that can use air pressure to squeeze ink, the highest smoothness of ballpoint pens on the market, etc., so far no company has a pen-making technology comparable to Mitsubishi, even if it is Baile or Zebra.
 
Mitsubishi's gel pen numbers start with "UM", "UMN" and "UB", with "UM" standing for cap-pulling, "UMN" for push-to-push, and "UB" for straight-liquid. Mitsubishi's main "bullet" nib, the process requirements are extremely exquisite, the easy-cutting steel is milled through more than 20 processes, the internal processing must reach the accuracy of one thousandth of a millimeter, and it must be matched with Mitsubishi's specific ink to play the best writing effect, and no one in the market can match. Compared with the needle type, the bullet is more fluid and not easy to fly white, and the pen is stable, which is suitable for sketching.
 
Mitsubishi launched the Signo series of gel pens in 1994, which accompanied the growth of a generation. As the pioneer of the Signo series, UM-151 has become the thinnest gel pen on the market with a slide ball diameter of 0.38mm and 0.28mm, with precise writing control and a price of about 5 yuan. Later, the Mitsubishi UM-201 once again set a new record for the thinnest gel pen with 0.18mm, and it was easy to write in the narrow space between the lines of a textbook. The color of the ink is positive, and the handwriting will not be smudged if it is occasionally stained with water. However, strong water resistance also means that it dries easily, so remember to close the cap after use.
 
If the UM-151 is an unshakable classic, then the UM-100 is an affordable work of conscience. The number represents the JPY sales price and series number set by Mitsubishi for this product, and "100" is the No. 1 pen with a suggested sales price of 100 yen. UM-100 has the largest sales volume, the average price is only 3.5 yuan, the pen barrel is transparent and visible, easy to replace the replacement core, the use of water-based ink, compared with the oily UM-151 and UM-155, the ink color is richer, the gloss is better, suitable for test papers or important document writing. The writing life of black UM-100 is about 500 meters, which is about equal to the writing volume of 20~30 Chinese test papers.
 
As the students' requirements for the thickness of the pen tip become higher, the UB series came into being, that is, the uni-ball rollerball pen, UB-150 as the originator of the series, with the advantages of coherent writing, low damping and strong comfort, is the best choice for shorthand, the price is about 7 yuan. The water output of the UB series is larger than that of both UM and UMN, and ink leakage often occurs. In recent years, Mitsubishi has greatly improved the ink, UB-200 uses cellulose (CNF) as a thickener gel ink, in the case of fast writing, the ink viscosity will change appropriately, the writing is smoother and more stable, the ink situation has been improved, and the price is about 9 yuan. Mitsubishi's gel pen is prone to beads or ink leakage when it is impacted by external forces, and you should try to avoid turning the pen and dropping the pen, but in terms of writing performance, the price is worth it.