The Ansmann Energy Check LCD test device displays the energy content of the cell in 10 % steps and the cell voltage in volts within 2 - 3 seconds. This is done very simply by using a contact pin or pressing.
Ansmann Tester Energy Check LCDSeems to work with most types of both rechargeable and normal batteries (with the exception of lithium rechargeables).
Definately better than the cheap passive battery testers out there. A great battery tester!