A new tape measure was off by 1/8 inch and ruined two days of cabinet work

The account appeared on Reddit's r/Carpentry forum under the title "Crescent Lufkin Tapes, Buyer Beware." It describes one tape, not a test of the brand, and the error came to light only when the final cabinet on each wall would not go in. Set against four other tapes, the new one read 1/8 inch different, while those four matched each other within 1/32 inch.

NIST Handbook 44, the standard that weights and measures officials apply to tapes used in trade, allows a steel tape 1/32 inch of error up to 6 feet and 1/16 inch from 7 to 30 feet. An eighth of an inch inside that range is twice the limit. On a run of cabinets, small errors stack up box by box and show at the last one on the wall.

Family Handyman explains that the hook rides on loose rivets so it can slide by its own thickness: out when it is hooked over an edge, in when it is pushed against a surface. Drops and heavy use wear the rivets or bend the hook. The magazine's test is to hook the tape over an edge, then push it against the same surface, and the two readings should match. A hook fault gives the same offset at every length, while an error in the printed blade usually changes with distance, so check at 2 feet and again at 8 or 10.

Before the first cut, lay a new tape beside a trusted tape or steel rule at several lengths, check every tape on the crew against one master at the start of a job, and take layout and cuts off the same tape. According to NIST, manufacturers check random samples from each batch on a laser bench, which leaves room for a bad tape to reach the shelf.