| 1965 | Mechanical 'Punched Tape' Level Recorder for remote data transmission |
| 1970 | ALLGOMATIC - electronic data collection and transmission |
| 1975 | ODS 1 - pressure probe with piezo-resistive measuring cell |
| 1985 | Micro data logger series HYDRUS and first pressure probe for groundwater measurement with resistive ceramic pressure transducer |
| 1989 | ODS 4 - capacitive, oil-free ceramic reference pressure transducer, long-term stable, with humidity absorbing system |
| 1990 | OTT HYDROSENS system - electronic data collection and transmission system |
| 1994 | OTT Pluvio – OTT-Innovation: First all weather precipitation measurement instrument using the weighing principle.New standard in the class of precipitation measurement |
| 1996 | OTT Orphimedes - OTT-innovation: first groundwater data logger with bubble gauge principle, new standard for price-performance ratio
OTT Thalimedes - float-operated shaft encoder with integarated data logger, IrDA interface, SDI-12 output and mm-accuracy |
| 1996 | VOTA - multi-functional unit, robust, especially developed for the field application
OTT HYDROCOM 1 - OTT-development METEOSAT Transmitter, satellite communication for environmental data
OTT Kalesto - radar senser for contactless water level measurement
OTT Hydras 3- application software with alarm management, central software with hydrological evaluation routines |
| 1997 | OTT Compact Station - autonomous measurement station |
| 1998 | OTT Sonicflow - continuous discharge measurement with ultrasound |
| 2001 | OTT Logosens - station manager, multi-channel data logger with flexible sensor connecting system |
| 2003 | SerWa - SMS based data service platform for automatic data transfer and data publication via internet |
| 2004 | OTT Vota 2 - multi-functional unit: measurement, collection, transmission
OTT PS 1 - pressure probe with scalable 4...20mA output and digital SDI-12 interface |
| 2005 | OTT Parsivel - laser-optical disdrometer for automatic precipitation qualification
OTT HDR, Meteosat / Goes - satellite transmitter for 'high data rate' applications |
| 2006 | OTT ITC – GSM / SMS data communication decive especially designed for groundwater applications
OTT DuoSens –- Compact data logger with focus on flexible data transmission - supports GSM/ SMS/ GPRS/ Satellite / Telephone
OTT SLD – Ultrasonic Doppler snesor for flow velocity measurement
OTT CBS – new bubble sensor usi intelligent pumping strategy. With scalable ...20mA output and digital SDI-12 interface |
| 2007 | OTT RLS - pulse radar sensor for contactless waterlevel measurement in surface waters
OTT Qliner - mobile flow measurement system
Orpheus Mini - flexibly applicable, professional groundwater data logger for 1' well pipes or larger. Power supply by lithium or standard batteries. |
| 2008 | OTT ADC - acoustic digital current meter measures point velocities in open channels
OTT Pluvio2 - new generation of precipitation gauges. Continually and precisely measures quantity and intensity of precipitation - in any weather
OTT PLS - robust ceramic pressure probe to measure waterlevel in ground and surface waters |