You'd certainly get what you pay for, but that may well be range, rather than accuracy. I suspect that if you took it down to your local decent garage/workshop (probably a main dealer or someone) they'd have a calibrated torque meter that you could test it on. You could make a mark if it's miles out if you're using it for a set use over and over and just nip back and ask them to re-check it occasionally - it's a two second job to check.

I suspect that as someone's said, if you tried anyone's several year old wrench it'd be miles out. Our meters (at work) are sent away anually to be checked then most of the wrenches are self calibrated/checked before each use, although some get sent away anually too. Apparently some of the electronic ones you can adjust to allow for out of cal.

thanks for this op.

went and got one this morning.

got home, opened the sealed box up and it looks like its been kicked about the floor before boxing it. covered in scuff marks and it doesn't show a full led display when plugged in.

back to aldi I go, I have no fking luck

To add - I have just seen that screwingflix sell one for £22

got a replacement aldi battery charger and used it last night.

THought it was great, easy to use, shows the capacity of the battery and has a trickle function. Not bad for £14

The Aldi is a proper smart battery charger i.e. it uses a micro-controller to regulate charge current and voltage. The Oximiser is essentially just a trickle charger, it has no intelligence built in, just a simple voltage cut off circuit.