Automatic pH calibration up to 5 points using NIST, USA or Custom pH buffers
0.01 pH resolution
Offset and slope display 
Automatic / Manual temperature compensation and temperature calibration function
Auto log data; Built-in memory can store up to 1000 data
Auto-shut off (programmable: 1 to 30 minutes)
Auto-Hold / Auto-Stable measurement
Calibration alarm (programmable 1 to 400 days)
Built-in electrode holder allows 2 electrodes to be attached on both sides of the meter
Large backlit LCD: 52mm x 64mm
RS232 output for connecting to computer or printer
Casing is IP67 waterproof (for 30mins immersion in 1m depth of water) and dustproof
Powered by 2 x AAA (LR03) or Ni-MH rechargeable batteries or power adaptor
Packaged in new molded carry case