SDG #250 Metcal GT4 Slim Handpiece, GT90 / GT120 GT Adjustable Soldering Station

Metcal’s GT series moved the company away from its long-standing fixed-temperature Curie point approach into adjustable territory, and the GT4 is the slim handpiece option that finally makes the platform competitive on ergonomics. This video looks at how the GT4 behaves on both the GT90 and GT120 base stations, starting with the firmware update required to recognise the newer pencil before it will run properly.

The practical focus is on the things that actually matter day to day: how the slim grip compares in the hand against the chunkier original GT handpiece, how quickly the cartridges come up to temperature, and whether the thinner assembly gives up any thermal performance when working on larger joints. Temperature accuracy is verified against the station readout, which is worth watching if you rely on a station for repeatable process temperatures rather than just guessing at a dial setting.

Soldering segments cover through-hole and surface mount work on a freshly assembled board, so you can judge tip access, recovery under load and how clean the wetting behaviour is with quality leaded solder. Cartridge swapping is also demonstrated, which is a useful gauge of how quickly you can move between a fine conical and a chisel or hoof tip mid-job.

For buyers, the takeaway is about positioning. The GT4 makes an already capable adjustable Metcal station much more pleasant for fine detail work, but the comparison to lower-cost alternatives in the same performance bracket is the real deciding factor, and the conclusions address exactly where the extra money goes.