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    A&D LifeSource UB-521 — Digital Wrist Blood Pressure Monitor Datasheet

    August 31, 2026 2 min read

    Product datasheet for the A&D Medical / LifeSource Digital Wrist Blood Pressure Monitor, Model UB-521.

    💾 Download Original PDF
    Full text manual (for reference)

    Product datasheet for the A&D Medical/LifeSource Digital Wrist Blood Pressure Monitor, Model UB-521 — a compact, travel-friendly wrist monitor with one-button operation and 90-reading memory.

    Overview

    A&D Medical has applied state-of-the-art measurement technology to monitoring blood pressure at the wrist with the push of a single button. This wrist monitor is smaller, lighter, and more compact than other wrist monitors — ideal for travel. Unlike monitors that measure blood pressure during cuff deflation, the UB-521 measures during cuff inflation for a faster, more comfortable reading. Automatic memory keeps the last 90 blood pressure measurements for tracking.

    The average reading feature automatically calculates the "average" of total readings stored in memory. The UB-521 also includes the Irregular Heartbeat feature, which provides blood pressure and pulse rate measurements even during an irregular heartbeat and alerts the user. A rigid carrying case is included.

    Key Features

    • 90 Memory Recall
    • Pressure Rating Indicator™
    • Irregular Heartbeat Detection
    • Displays average readings
    • One-touch button operation
    • Ideal for travel
    • Simultaneous readout of systolic/diastolic pressure and pulse rate
    • Bilingual instruction manual with blood pressure log sheets (English and Spanish)
    • Rigid carrying case included
    • Includes two "AAA" batteries

    Part / UPC / Cuff Size

    Part Number UPC Number Cuff Size
    UB-521 0-93764-60213-9 5.3" – 8.5" (13.5 – 21.5 cm)

    Technical Specifications

    Dimensions 1.2" (d) x 2.4" (w) x 2.6" (h) (30 x 60 x 65 mm)
    Weight 3.2 oz. (89 g) without batteries
    Display Digital, 9/7 mm character height; pressure and pulse displayed simultaneously
    Memory 90 readings
    Pressurization Automatic, using micropump
    Deflation Constant air release-valve system
    Type Oscillometric
    Accuracy Pressure: ±3 mmHg or ±2%, whichever is greater; Pulse: ±5%
    Pressure Range 20 mmHg to 280 mmHg; Pulse: 40 to 200 pulses/minute
    Power Source Two type AAA alkaline batteries (1.5 volt), included
    Battery Life Approx. 400 measurements
    Operating Environment 50° to 104°F (10° to 40°C)
    Storage Environment 14° to 140°F (-10° to 60°C)

    Accuracy Standard

    Blood pressure measurements determined with this device are equivalent to those obtained by a trained observer using the cuff/stethoscope auscultation method, within the limits prescribed by the American National Standards Institute (ANSI/AAMI SP10) for electronic sphygmomanometers. Manufactured by an ISO 9001 and ISO 13485 registered company. Engineered in Japan. Made in China.

    What's Included

    Each unit comes with a bilingual instruction manual with blood pressure log sheets, a quick start card, two AAA batteries, and a carrying case.

    Manufacturer

    LifeSource / A&D Medical. 1756 Automation Parkway, San Jose, CA 95131. Toll-free: 1-800-726-3364. www.LifeSourceOnline.com. Pressure Rating Indicator is a trademark of A&D Medical (Patent Pending). LifeSource is a registered trademark of A&D Medical. ©2008 A&D Medical. All rights reserved.