Designed for mobile service, the Robinair Premier R-1234yf Recover, Recycle and Recharge Machine, No. AC1234-4SL,is a fully automatic R-1234yf ACS machine with an integrated scale lock that eliminates the need to recalibrate your refrigerant scale after transporting long distances. Accessible from outside the machine, the lock secures the scale, preventing damage or inaccurate refrigerant measurement. The safe startup feature prevents powering on when the lock is engaged, keeping technicians protected. Additionally, an indicator light reminds technicians to lock the scale before transport, while tie-down points and guidelines ensure your machine is secure for mobile service.