Tekpower TP3016M Portable Handheld Variable DC Power Supply with USB Port 0.3V - 12V @ 0 - 3.75A or 0.3V-30V@ 1.6A with VC and CC Control Upgraded TP3005DHY3005 Mastech

Easy to use, clean power, solid regulation, and accurate. It outputs a maximum of 3.75 amps or 50 watts, whichever is lower. e.g. 3.33 amps at 15 volts, 2..08 amps at 24 volts, or 1.67 amps at 30 v. There's a software calibration mode but mine was spot on to my DVM, within a few hundredths of a volt so I didn't bother with it. The USB outputs are fixed at 5.1 v (a good thing) but you can set current limits at anything up to 2.5 amps and monitor actual current. Minor quibbles: The manual is poorly translated but the interface is pretty intuitive. The power button just controls the output so the unit stays on as long it's getting AC. Build quality is excellent overall but the included output leads are crappy. Much more compact and handy than an equivalent linear power supply. Highly recommended.

The item is correct however the seller as well as Amazon both had irresponsible behaviour. Despite non delivery complaints Amazon did not do anything nor they called to know the status. Amazon has proved to be unreliable and unprofessional b2b seller.

A power supply with no power switch? Yup. A button that sets it to +5v, 2.5A with one accidental touch? Yup. Random voltages, including negative on the outputs? Why not.

Como explico en el video. La única razón para comprarla es para que no ocupe espacio al salir a campo. Fuera de eso para uso diario de verdad que no es nada cómoda usarla, no se puede visualizar voltage y corriente a la vez. O visualizamos una u otra y eso resulta muy molesto.. Resulta estorbosa porque el cable va conectado arriba. Aparte que no trae ni siquiera un interruptor de encendido. Para tenerla como uso diario sinceramente NO LA RECOMIENDO. Si salen a dar servicios y tienen poco espacio es creo la única alternativa que he visto. Se requiere una bolsa para guardarla porque no trae. Mi fuente favorita sigue siendo la Riden DPH5005. Lo único malo es que no trae una carcaza. Tuve que fabricarle una. Pero es mi favorita porque es extremadamente fácil y práctica de usar. Todo lo contrario a esta fuente.

I was looking for a smaller adjustable DC power supply, for occasions when I don't want to drag out the big bench supply, or when I need portability. This Tekpower TP3016M (newer revision), is just the ticket. Being revised, mine does not have the issue with negative voltage when the output is off. The voltage and current ranges are quite impressive for such a small unit (roughly the size of a DMM). Some folks dislike the lack of a unit power switch, but I've personally found it not to be a problem.