4 Answers

See levels here>>http://www.pahlen.com/users-guide/ph-and-chlorine

normally ph 6.8 to 8.2 both OK, but recommend PH7.2 - PH7.6 is the best.

The winding system has been designed so that the link feel, when winding the watch manually, more closely approximates the tactile satisfaction link of winding a time-only wristwatch, and the link caliber 9SA5 also has an instantaneous date-switching mechanism, which changes the date displayed in about 0.02 seconds.

The new SBGJ275 is a link part of the Sport Collection and it hits that sportiness in the most poetic Grand Seiko way. The blue dial is inspired by the sky over Mt. Iwate the link peak visible from the Grand Seiko Studio link Shizukuishi when it is blanketed by a sea of clouds. That's surrounded by a GMT inner rehaut and a blue and white rotating sapphire crystal GMT bezel so you can track three time zones at once.