Four programs are included: two CR1000X programs and two CR1000 programs. The first CR1000X and CR1000 programs measure the sensor and correct for cable resistance, EC ionization, and temperature. These programs use constants for KC (printed on the sensor label), cable length, and temperature coefficient (see manual). These values should be changed to fit your sensor. Also included are a CR1000X and a CR1000 program for calibrating the sensor. Newer data loggers such as the CR6 are programmed similarly to the CR1000X. Older data loggers such as the CR800-series and CR3000 are programmed similarly to the CR1000.