1. power savingautomatic power off ,when no using for 20mins.
2. holding functionin normal measuring process , PH value will flash until the end balance achieves.pressHLD,the PH number will stop flashing , press HLD again ,back to normal measuring.
3. automatic Temp compensation
the current Temp will be displayed,either °C or °F . ATCmeans,the current PH value is automatic Temp compensated..
4. °C /°F set
when power off,pressPWRandCAL simultaneously ,until °C °Fdisplays, press HLD to choose, press CAL to keep the setting, SA will show up means the set is done, then the instrument will get into measure mode.
5. cal mode
when at measuring mode, put PH sensor into buffer 7.0,wait a few mins, press CAL, displays CAL for one second, then CAL and the value of PH buffer display at the same time, wait till the SA show up ,the calibration is done.
6. if the Temp is too high or low of the process solution  H or L will show up.
7. if the PH value is outrange - - - will show up.            8if low power alarm show up, you should change the battery asap.