The RobinAir AC1234-4SL adds Scale Lock technology to the AC1234-4 platform. Scale Lock ensures precise refrigerant charging by locking the internal scale during the charge cycle, preventing vibration or movement from throwing off the measurement. Critical for R1234yf, where overcharging by even a few ounces can cause system damage.

Key Specifications

• Refrigerant type: R1234yf
• Standard and hybrid vehicle compatible
• Scale Lock precision charging
• Fully automatic operation
• 4.3" monitor display with analog gauges
• 1.5 CFM vacuum pump
• 30 lb internal tank
• Built-in refrigerant identifier
• 1-year warranty

For shops that demand exact charge weights — especially important with R1234yf where the cost per pound is 5–10x higher than R134a.

Freight included in price.