good product! The white backlight and black writing are clearly visible. This little guy can be used in almost all batteries. After carefully reading the instructions, I found that there is a user adjustment model that simply adjusts the voltage when the battery is fully charged and the voltage when the battery is low. With this model I can easily adjust the remaining battery capacity and percentage (if you think the percentage accuracy isn't good enough). The low voltage buzzer is also well designed. The manual is very meticulous: you will find many other features if you read it carefully. I can fully recommend this product. This really works for me. You just need to know the maximum and minimum battery voltage.
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