ALPA Shift Scale Stick PLUS, for ALPA 12 PLUS, +/- 20mm. The ALPA Shift Scale Stick PLUS is an accessory for the ALPA 12 PLUS. The magnetic connection to the ALPA 12 PLUS makes it extremely easy to insert and remove. Also, the scale of the shift scale stick can be easily rotated to any desired orientation for optimum readability. It enables the scale to display the current shift movement from the front and rear or the side. The indicator range is over 20mm in both directions. Due to the symmetrical design of the ALPA 12 PLUS, it can be used for both rise/fall and lateral shift movements.