The DM397 is an advanced full-featured digital multimeter designed for engineers, HVAC and electrical technicians, whose work demands greater accuracy and resolution. The RS232 printer port and software (included) allows any measured parameter to be monitored or recorded to a PC for further analysis or printing. The 50,000 count dual display shows two parameters simultaneously eliminating the need to toggle between selections. The DM397 stands alone as the best value in high-end multimeters. Five year limited warranty.