The CPE-2 machine is clever but limited. For example, it uses a mechanical thermostat and only runs at one speed - 75 revs per minute. The CPP-2 is a step up in reliability as an electronic thermostat for the waterbath is used providing lab-quality processing of film and prints.
This holds the temperature of the process to within +/- 0.1 deg C. It also uses a re-circulating water bath to temper the chemicals, with the bath temperature displayed on a digital readout.
You can quickly lower the temperature of the water bath too i.e. changing from a C-41 process at 38 deg C to an RA-4 process at 35 deg C. It is also much easier to set the temperature on the CPP-2. You program the temperature using three knobs for the tens, ones, and tenths of degrees. Typical capacities are 8x 35mm film or 6x 8 x 10 inch prints per run.
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