I have the same - cordless (for work under the car) - it was $$$ but justified the purchase first time it was used. Rated at 340 Nm if memory serves. If you're trying to undo a seized bolt on something like a flywheel they are a lifesaver. Not so controllable for refitting though so the relevant torque wrench needs to be available.
Achtungbaby - apologies if you've already tried this - get the CRC / WD40 / PB Blaster onto the fastener, let it soak in for at least three hours, then try taking it off. It takes a while for the stuff to penetrate the oxide or dust layer between the fastener and whatever it's attached to.
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