P755-LOG multi-function instrument for temperature-humidity-airflow-pressure incl. bluetooth- connection

High precsision 2- channel instrument with 0,01°C and bluetooth- connection for DEGrph Blue application

Incl. Bluetooth- connection for DEGraphBlue application
(App can be downloaded free of charge in the Play or App Store)

High precision data logger for temperature (±0,03), relative humidity, dew point, air flow with memory for 6.000 measurements. The instrument is designed for application of the quality assurance, e.g. testing climatic chambers, calibration thermostats, oven...or thermoelectrical processes. For the battery-powered instrument we provide a separate power supply as an option. The measuring interval is adjustable between 1 second and 30 minutes. By using our precision Pt100-probes with sensor calibration code you will reach the on page 12 descripted system accuracy. The P755-LOG measuring system is the perfect standard to test subordinated instruments or systems. For traceability we recommend to order those instruments with a calibration certificate.

Product features

  • USB interface
  • Optional DE-Graph Windows Software for graphic and tabular documentation
  • High measuring accuracy
  • Integrated calibration function for simple compensation of sensor tolerances
  • Physical 1-point, 2-point or 3-point calibration function
  • Measuring channels are freely assignable
  • Recording maximum, minimum, hold and average values
  • Integrated sensor holder for one hand operation
  • Mains operation possible
  • Simultaneous display of two measured values
  • Differential temperature display


The two multi-function-instruments are outstanding for theri high accuracy of ±0,03°C. You can optional plug in Pt100 or thermocouple (type J, K, L, N, R, S, T), as well as probes for humidity and flow. The high precision makes them eminently suitable as reference instruments for testing subordinate measuring instruments in quality assurance laboratories or for checking temperature- critical processes. These instruments are frequently provided with a DKD calibration certificate.

Order No.: 5000-B755L
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Technical data

Inputs 2-channel, Pt100, thermocouple: type K, J, L, N, R, S, T,
humidity, dewpoint, flow
Measuring range
Pt100 -200°C...+850°C
Thermocouple according DIN (-200°C...+1760°C)
Ohm 0...400 Ohm
Humidity 0 %...100 %rH
Flow 0...40 m/s
Pt100 ±0,03°C from -50°C...+199,99°C
±0,05°C from -200°C...+200°C
otherwise 0,05 %
Thermocouple R, S ±1,0°C +0,1 %
Thermocouple K, J, L, N, T

±0,2°C from 0°C...+200°C
±0,5°C to 1000°C
±1,0°C remaining range

Humidity ±1,5 %rH

1 % of end value

Ohm 0,5 % of measuring range
Resolution 0,01°C from -200°C...+200°C
otherwise 0,1°C respectively 0,1 %
Connectors DIN 8-pole
Working temperature 0°C...+40°C
Display 2-line LCD
Housing plastic
Dimensions 200 x 93 x 44 mm (LxBxH)
Weight 300 g
Power supply 9 V battery
Batterie life appr. 20 h

Areas of application

Areas of application in industry and laboratory for example
  • For taking measurements for quality assurance under ISO 9000
  • As a reference instrument for checking production
  • For taking comparison measurements in service and repair
  • For registration of humidity and temperature in air conditioning and environmental engineering
  • Long-period monitoring of temperature and/or relative humidity with online documentation


Type K, Cl. 1 -100...+1100°C 300 x 3,0 mm Ø
High temperature probe PT100 400 x 6mm
Combination probe, Stainless steel, for temperature and humidity
Combination probe, POM, for temperature and humidity
Macro Air
Micro Air ..20 m/s
Micro Air 40 m/s
Micro Water ..5 m/s
Mini Air ..20 m/s
Mini Air ..40 m/s
Mini Water ..5 m/s
Pt100, immersion probe for fluids, Cl. B -30...+150 °C 80x3,0mm
Pt100, Cl. 1/10 DIN -200...+450 °C 150 x 3,0 mm
Pt100, Cl. 1/10 DIN -200...+450 °C 300 x 3,0 mm
Pt100, Cl. 1/10 DIN -200...+450 °C 300 x 6,0 mm
Pt100, Cl. 1/3 DIN -200...+450 °C 150 x 3,0 mm
Pt100, Cl. 1/3 DIN -200...+450 °C 300 x 1,5 mm
Pt100, Cl. 1/3 DIN -200...+450 °C 300 x 3,0 mm
Pt100, Cl. 1/3 DIN -200...+450 °C 300 x 6,0 mm
Pt100, Cl. 1/3 DIN, -30...+200°C
Pt100, Cl. A -100...+260°C, 300 x 8,0 mm
Pt100, Cl. A -100...+260°C, 500 x 8,0 mm
Pt100, Cl. B -50...+350 °C 150 x 4,0 mm
Pt100, Cl. B -50...+350 °C 300 x 4,0 mm
Pt100, Cl. B -20...+200 °C 50x12mm
Pt100, Cl. B -200...+550°C 300 x 6mm
Pt100, Cl. B -40...+200 °C 150 x 6 mm Ø
Pt100, Cl. B -50...+250 °C 250 x 4 mm Ø
Pt100, Cl. B -50...+350 °C 150 x 3,0 mm
Pt100, Cl. B -50...+350 °C 300 x 3,0 mm
Pt100, Cl. B -50...+350 °C 500 x 3,0 mm
Type K, Cl. 1 -100...+1100°C 300 x 1,5 mm Ø
Typ K Surface probe with thermocouple strip 150 x 15mm
Typ K, Cl. 1 -100...+1100°C 300 x 4,0 mm Ø
Type K, Cl. 1 -100...+1100°C 500 x 1,5 mm Ø
Type K, Cl. 1 -100...+1100°C 500 x 3,0 mm Ø
Type K, Cl. 1 -100...+800°C 100 x 0,5 mm Ø
Type K, Cl. -30..+75°C
Type K, Cl. 1 -30...+250°C 26,0 mm Ø
Type K, Cl. 2 -40...+200°C
Typ K, Kl. 1 -40...+900°C 130x8,0 mm Ø 90°
Type K, Cl. 1 -65...+350°C 130 x 10mm Ø
Type K, Cl. 2, -40...+400°C 120x3,5 mm Ø with S8 Round connector
Typ-K Surface probe 150 x 9mm
Typ-K Roller Surface probe up to 450°C



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