Not on the MOT approved list

Or you could use a 1.5 mm allen key. It has a better bend than those, which quite often can't be used with the wheels on.

I now use a 90degree probe for those I can't see, Insert the tip between disc and pad and use my skill and experince to decide whether the pads a fail, or in that "really knackered but I've got to pass it" zone

I have a piece of copper brake pipe flattened on the end to 1.5 mm easy to bend into awkward places ,