The RKL comes with the head unit, PC4 (outlet strip), and a temperature probe. This model is in stock.

The RKL+ comes with the head unit, 2x PC4, Temp Probe, PH Probe, and SL1 (Input module for ph, orp, temp, and 2 switch ports. These I can order for you along with any other model or accessory. Give me a call or swing by if you have more questions.

Louis