ing the M+ button displays the average value AVG of the 3
most recent measurements stored in the user memory. By
pressing the + button, the most recent measurements are
displayed; by pressing the - button, the oldest are displayed.
• The average value AVG can only be displayed if there are 3
saved values in the respective user memory.
• To clear the memory, you must first select a user memory.
Hold the SET button pressed for approx. 3 seconds. All the
values in the current user memory are deleted after 3 brief
beeps are output.
• If you wish to change the user memory, see "Select memory".
7. Cleaning and storing the instrument
• Clean your device and cuff carefully only with a slightly mois-
tened cloth.
• Do not use detergents or solvents.
• On no account must you immerse the computer in water,
otherwise liquid can enter it and cause demage.
• When storing the device, make sure that no heavy objects
are placed on top of it. Remove the batteries. The cuff tube
should not have any sharp kinks.
8. Error messages / troubleshooting
In case of faults, the Err message appears in the display.
Error messages can occur when
1. inflation pressure is higher than 300 mmHg,
2. blood pressure is unusually high or low,
3. you move or talk during the measurement.
In the above cases, you must repeat the measurement. Make
sure that the cuff tube is properly inserted and that you do
not move or talk. Re-insert the batteries if necessary, or else
replace them.
9. Specifications
Model No.
Method of Measure-
ment
Range of Measurement systolic 0 – 300 mmHg,
Accuracy of the
pressure reading
Measuring uncertainty max. permissible standard deviation
Sets of Memory
Unit Dimension
Unit Weight
Cuff Size
Operating Temperature + 5 °C to + 40 °C, < 85 % RH
Storage- and
transporttemperature
Power Supply
17
SBM 21
Oscillometric, non-invasive blood pres-
sure measurement on the upper arm
diastolic 0 – 300 mmHg,
pulse 30 –180 beats/minute
systolic ± 3 mmHg /diastolic ± 3 mmHg /
pulse ± 5 % of the displayed value
according to clinical testing:
systolic: 8 mmHg /diastolic: 8 mmHg
4 x 30 memory places
L155 x W110 x H70 mm
Approx. 405 g
Cuff for upper arm circumference of
22 to 36 cm
- 10 °C to + 55 °C, < 95 % RH
4 x 1,5 V AA batteries (alkaline type
LR06)