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The Welch Allyn 7670-03CB Tycos 767 Aneroid Sphygmomanometer with Mobile Stand is certified accurate to ±3mmHg. Large, easy-to-read dial face (6.25" / 15°Cm) is laser-engraved for accuracy and recessed to reduce parallax. Features ruby-jeweled movement for long life. Thermally treated diaphragm maintains calibration.
Cheaply made. Screw keeps falling out. Needs recalibrated after 3 uses. Tole to take it apart and return to reclibrate it. Not worth the money.