Citizen - CH 657 digital blood pressure monitor Black

Citizen - CH 657 digital blood pressure monitor Black

Portable and slim wristwatch style blood pressure monitor

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Further information


  • 90 memory recall function
  • Irregular heartbeat indicator
  • Body movement indicator
  • Average of last 3 readings
  • 15mm-Slim design
  • Large LCD display
  • Large buttons for easy operation
  • One-touch operation
  • Automatic Power-off
  • With compact storage case

General remarks on blood pressure and blood pressure measurement:

  • To deflate the cuff quickly, press the “START/STOP” switch.
  • The attached cuff is suitable for wrist circumferences of 13.5-21.5 cm.
  • When attaching the cuff, the body of a blood pressure monitor should be placed on the inside of your wrist.
  • Self-measurement is not a therapy! In no event should you change the dosage of your medication prescribed by your physician
  • As preparation for measuring your blood pressure, you should urinate and then remain relatively still for 10 to 15 minutes prior to measurement.
  • Exercising, eating, drinking, smoking, etc., prior to measurement may affect the results.
  • Your blood pressure varies constantly throughout the day. Measurements should be taken regularly at the same time each day.
  • DO NOT place too much emphasis on the results of one measurement. Keep a continuing record of your blood pressure variations. A complete picture can only be obtained from a large number of readings.
  • Emotional stress tends to cause your blood pressure to rise.

To obtain correct blood pressure measurements

  • Take five or six deep breaths and then relax before measuring your blood pressure. If you are tense when taking the measurement, you will not get a valid reading.
  • Your blood pressure will be elevated if you are anxious or irritated, suffering from lack of sleep or constipation, or have just taken some exercise or eaten a meal.
  • Wrap the cuff around your wrist snugly.
  • DO NOT measure your blood pressure after bathing or drinking.
  • If you feel the need to urinate, do so before measuring your blood pressure.
  • Measure your blood pressure where the room temperature is around 20°C. DO NOT measure your blood pressure when it is too cold (below 10°C) or too hot (above 40°C) in the room.
  • DO NOT try to measure your blood pressure immediately after drinking coffee or tea or after smoking.
  • Measure your blood pressure when you are relaxed and still. Keep the centre of the cuff at the level of your heart and DO NOT move your arm or talk.
  • DO NOT measure blood pressure when the cuff has been on your wrist for a few minutes or more. During this time, your wrist will have built up higher blood pressure and you will not get a valid reading.

Measure your blood pressure at the same time each


  • Your blood pressure changes all the time. This means that data gathered over a long period has far more significance than data from just one measurement. For this reason, you must measure your blood pressure on a daily basis. Ideally, you should measure your blood pressure at the same time each day, wherever possible.

Precautions for use

  • If you suffer from heart disease, high blood pressure or other circulatory diseases, consult your physician before using the monitor.
  • If you feel abnormal pressure of the cuff during use or any other irregularity, reduce the pressure by immediately switching off the power or remove the batteries
  • If you think the measurement is abnormal or if measurement makes you feel unwell, discontinue use and consult your physician.
  • Blood pressure measurement may not be possible for anyone with a weak pulse or arrhythmia.
  • Repeated blood pressure measurement may cause problems such as congestion or swelling in some people.
  • Frequently repeated blood pressure measurements will not give accurate results. Allow an interval of about 1 minute between measurements.
  • If you suffer from a severe problem with blood circulation in your arms, consult your physician before using the monitor. Failure to do so could be hazardous to your health.
  • Measurement may not be possible for anyone with insufficient blood flow to the area where measurements will be taken or who suffer from a frequent irregular heartbeat. Consult your physician for advice on whether to use the monitor.
  • DO NOT wrap the cuff around an injured wrist.
  • DO NOT wrap the cuff around a wrist in which a drip (intravenous infusion) is inserted, or which is being used for blood transfusion as part of medical treatment. Doing so could result in an injury or a serious accident.
  • DO NOT use the monitor in the vicinity of flammable gases such as those used for anaesthesia. Doing so could ignite the gases and cause an explosion.
  • DO NOT use the monitor in enriched oxygen environments such as a hospital’s hyperbaric chamber or an oxygen tent. Doing so could ignite the oxygen and cause a fire.
  • DO NOT use mobile phones near the monitor as this could result in a malfunction.
  • If you use a cardiac pacemaker, consult your physician before using the monitor.
  • 1Be sure to use this unit only for measuring blood pressure. DO NOT use it for any other purpose.
  • DO NOT use this unit on infants.
  • Blood pressure measurement may not be possible for anyone with common arrhythmias such as atrial or ventricular premature beats or atrial fibrillation.

Maintenance Precautions

  • DO NOT store the blood pressure monitor in locations exposed to direct sunlight, high temperatures (over 60°C), low temperatures (below -20°C), high relative humidity (over 95%) or excessive amounts of dust.
  • DO NOT drop the blood pressure monitor or subject it to other shocks or vibration.
  • Remove the batteries if the monitor will be left unused for a long period.
  • DO NOT attempt to disassemble the monitor.
  • DO NOT bend the cuff excessively.
  • If the monitor is very dirty, wipe it clean with a cloth moistened with sterilizing alcohol or a neutral detergent. Then wipe it with a dry cloth.
  • NEVER clean the blood pressure monitor with thinners or benzene, as this could damage the monitor.
  • To clean the cuff, wipe it with a moist cloth. Avoid hard rubbing, as this will cause air leakages.
Measurement systemOscillometric method
Measurement localizaitionWrist
CuffSoft cuff
Wrist circumference range13.5~21.5cm
Measurement rangePressure: 0 to 280 mmHg Pulse: 40 to 180 pulse/min
AccuracyPressure: ±3 mmHg Pulse: ±5% of reading
DisplaysPressure: 3 digits Pulse: 3 digits
Rated voltageDC3V (:Direct Current
Power sourceAAA size×2
Battery lifeAlkaline battery: Approx. 400 times
Outside dimensionsW69×H70×D15mm
WeightApprox. 86g (without batteries)
Accessories2 AAA batteries for the monitor (LR03), Instruction Manual, Storage case

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Divson Pharmaceuticals Ltd
Medical instruments and supplies
As a healthcare company they are able to source and supply medical instruments and sterile-packed instrument kits from trusted manufacturers internationally. Surgeons, and patients alike can rely on Divson Pharmaceuticals single procedure instruments each day to safely secure medical device implants.