The Welch Allyn Tycos 767 Series Two-Piece Cuff & Bladder Blood Pressure Monitor 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.