loads on ebay "Adjustable DC Linear Bench Power Supply" - I got a couple of the 30V 5A ones for £45 each at the time, had them several years and really good, pretty accurate Volt reading and current limiter works well.
Maximum output is 30V at 5A. Output of between 0-30V at anything from 0-5A can be set by the user. The user can toggle between the tenths, units, and decimal columns. 4 digit LED display. We’re here to help.