מִשְׁקֶלֶתmishqeleth

levelling instrument, level, (for horizontal accuracy) (Isaiah 28:17; 2 Kings 21:13)

Pronunciation: mish-keh'-leth · Hebrew/Aramaic (Old Testament) · H4949

Same root

מִשְׁקָלmishqâl · H4948weight (numerically estimated); hence, weighing (the act)
מַשְׁקוֹףmashqôwph · H4947a lintel

Where it appears

Appears 2 times in the Bible.

2 Kings 21:13 I will judge Jerusalem by the same standard I used for Samaria and the same measure I used for the family of Ahab. I will wipe away the people of Jerusalem as one wipes a dish and turns it upside down.
Isaiah 28:17 I will test you with the measuring line of justice and the plumb line of righteousness. Since your refuge is made of lies, a hailstorm will knock it down. Since it is made of deception, a flood will sweep it away.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).