It is a 12V Constant Current battery tester specially designed for SMF batteries ranging from (2.5Ah to 14Ah). You can take Instant test as well as long duration capacity test. Select the mode instant or capacity as per your need. Set the battery Ah capacity and start the test. A constant current load is automatically gets selected according to set capacity. For instant test, it will show battery status as GOOD, WEAK or BAD. For capacity test, it will show back up time in Minutes.