What 29 CFR 1910.244 requires (plain English)
29 CFR 1910.244 covers "other portable tools and equipment": the portable equipment not addressed by the powered-hand-tool guarding standard (1910.243). Its two main subjects are jacks and abrasive blasting.
For jacks (lever and ratchet, screw, and hydraulic jacks used to lift heavy loads) the standard's core rules are that the operator must make sure the jack used has a rating sufficient to lift and sustain the load; the rated load must be legibly and permanently marked in a prominent location on the jack; and jacks must be used on a firm foundation, centered under the load, with the load blocked or cribbed as it is raised so it cannot drop if the jack fails or slips. There are also requirements for inspecting and maintaining jacks.
The standard also addresses abrasive blasting equipment and operations. Throughout, 1910.244 targets the crushing and equipment-failure hazards of these portable tools: a jack that fails under an excessive load, or slips off poor footing, drops its heavy load onto whoever is beneath or beside it, which is why the rating, marking, and blocking rules matter.