Handheld photometers for use in a wide range of areas such as process control, mobile water testing or wine industry. Easy operation with menu driven, user guidance. Smart cuvette adapter: holds 28mm or 16mm round cuvettes with height 91 to 104mm; to be used with a variety of different test types. Optics: LED's with filters, accuracy < 2nm, 436nm, 517nm, 557nm, 594nm, 610nm, 690nm. Concentration, Absorption, Transmission. Methods can be downloaded from the Internet. 35 (pHotoFlex® STD) 100 user defined routines. 100 (pHotoFlex® STD) / 1000 data sets, RS 232 interface. pH range: pH 0 to 16.00 (±0.01) for DIN standard combination electrodes. Incl. calibration interval and calibration protocol. Batteries: 4 button cells. Optional: LabStation with rechargeable batttery and power plug, GLP-compliant software LSdata for simplified laboratory evaluation and operation, charging function; accu and power supply separately. LSdata is also available as stand-alone package. pHotoFlex® STD: Water Analysis purely w/o pH- and turbidity measurement for standard parameters. pHotoFlex® pH: Just like the standard version of pHotoFlex STD plus full electrochemical pH-and ORP measurement via electrodes. This allows also the measurement of the parameters NH3 and CO2. pH 0 ... 16,00 (±0,01) for Standard-DIN pH-electrodes with automatic temperature compensation ATC and automatic buffer recognition. Calibration intervall setting and calibration record.