OPERATION INSTRUCTION WS 9121 
A.  Mode switchable 
Press [MODE] to switch among the status of Time, Alarm and Calendar. 
 
B.  Time Mode 
1). Starting from the normal time display status, press [SET] 2 seconds to enter the setting status 
of 12/24hr, Hour, Minute. Press [ADJUST] to plus one. Press [MODE] to quit the setting status. 
2). At normal time display status, press [ADJUST] or [MAX/MIN] key to check the MAX, MIN of 
temperature and hygrometer, press [ADJUST] for 2 seconds to clear the memory of MAX, MIN 
temperature and replaced with current value. 
3). At normal time display status, press [SET] or [C/F] key to change the     
    °C and °F degree display 
4). At normal time display status, press [MODE] key once to enter the     
      Alarm status as below. 
 
C. Alarm Mode 
            1). Starting from the normal time display status, press [MODE] key once to enter the waiting status 
of alarm setting, then press [SET] 2 seconds to set the Alarm time of Hour and press [SET] 
again to set Alarm time of Minute. Press [ADJUST] to plus one. After setting, press [MODE] to 
quit the Alarm setting status. 
2). Starting from normal time display, press [MODE] to enter Alarm status, then press [ADJUST] 
to switch the Alarm, and the beep each hour. 
3). Press [MODE] key to quit. 
 
D. Calendar Mode 
            1). Starting from normal time display, press [MODE] twice    to enter waiting status of Calendar 
setting,  press  [SET]  key  for  2  seconds  to  enter  Year  setting,  press  [ADJUST]  to  plus  one. 
Press [SET] and [ADJUST] key in turn to adjust Month, Date accordingly. 
2). Press [MODE] to quit the Calendar Mode and resume the Time display status. 
 
Measuring Temperature Range: -50°C / +70°C ( -58°F / +158°F)    
Measuring Humidity Range: 20% RH / 99% RH ("LL" for below 20% and "HH" for above 99%) 
 
Operated by 2x AA batteries (not included)