An all-in-one tool for 12v battery care at home or shop. Diagnoses, recovers, charges, tests and optimally maintains, automatically. Retains all the fully automatic, 100% safe, easy-to-use characteristics, of the. 2 million optimeters produced since 1995, but is now microprocessor-controlled, lighter and more efficient than ever. Comes with global input (100-240v) and is 33% more powerful than its predecessor. For batteries forgotten over the winter, optimeter 3 will recover them from deep discharge and optimally recharge them, it will check that the charge delivered is the best possible before then checking how well the battery can retain the charge. Batteries status can be checked at a glance. Optimate 3 will then maintain the battery/batteries at full charge safely for months at a time and prolong their life by up to 400%.