The Maha PowerEx MH-C9000 WizardOne Battery Charger & Analyzer is suitable for casual consumer users, enthusiasts and professionals, capable of charging, conditioning, analyzing, cycling, forming and discharging one to four AA or AAA batteries, all while digitally displaying the battery capacity and voltage. All four slots can be operated independently in different modes and settings. A total of five modes are available.Those seeing the unit for the first time will be struck by its large LCD screen, backlight by ultra-bright white LEDs. Measuring over 3.5" x 1.5", the display is more than three times larger than its closest competition and shows a wealth of information that is very easy to read.The MH-C9000 is also incredibly accurate. Using a quartz oscillator time base typically found in computer boards, it is able to report capacity within 1% accuracy across multiple units making battery bench marking more meaningful.