A handheld apparatus for checking the tension of a flat spring, including: a support having two spaced pegs rigidly secured thereto; a spring mounted on the support between the two pegs; the spring and the pegs being arranged such that a glass needle passing in a predetermined path over and/or under the spring and the pegs is deflected from its normal position and exerts a pressure on the spring in a predetermined direction; a displacement measuring device associated with the spring and adapted to measure the displacement of the spring when a glass needle is in said predetermined path; preprogrammed computing means electrically connected to the displacement measuring device and adapted to display upon a read out a reading for the tension upon the wire when the wire is in said predetermined path; the computing means being connectable to a fully portable electrical power source.
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