Variable voltage, stabilized DC power supply with two analog meters. - Model: PAB 32-3 - Voltage adjustment: Variable - Ammeter: Two analog meters - Output terminals: Red (+), Black (-) - Power switch: Yes - Cooling fins: Yes ◎ This is a "DC stabilized power supply" with an output voltage of 0V to 32V (current: 3A Max). ◎ Since "current control" is possible, constant current supply is also possible. ◎ As shown in the photos, I have used it as an "electronic circuit experiment power supply" and a car "battery charger." ◎ To prolong the life of car batteries, I used to charge them at "1A current" for 12 hours initially (for a 12AH capacity), and then increased the current to "3A" for an additional 4-5 hours, adjusting according to the battery's condition. (Even if the voltage is set to maximum, it's safe because it provides "constant current supply" if you match the "current.") ◎ The "jumper pin" on the back is broken, but I have used it without any functional issues, so I don't think there will be any problems. (If you are concerned, you may want to refrain from purchasing.) ◎ I have used it in the state shown in the photos without knowing the meaning of the "M-S" switch. ◎ The output terminals are compatible with "banana plugs," and the external connection plate in the middle (currently fixed to the negative side ➡ if the positive side is connected to the external terminal, the risk of a short circuit increases) can be changed to either "+" or "-", and can also be fixed in the "intermediate position without connection" by placing the plate vertically. ◎ Operation has been confirmed. (When the power is turned on, the "voltmeter" shows at least "2V" in a no-load state.) ◎ Since it is old, please purchase it with "no claims and no returns." ◎ Shipping will be via "Takkyubin (home delivery service)."