PRO TREK Twin Sensor Twincept

The Twin Sensor
Fantastic accuracy to 5 meters altitude, that is what this little technological wonder will deliver. The bracelet's folded aluminium links are less sought after ;-) but the light weight of this watch sure comes as a suprise. Wearing comfort is also very good given the bulky shape of the watch.
The bolt producing division of Casio or the supplier of bolts will like this sensor's design: 6 bolts just to pop the sensor to the watch.