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Model GL900 - OBSOLETE

Handheld 8-channel Data Logger

Out of


  • Includes a GL900 data logger, an AC adapter, an NIST-traceable calibration certificate, and software on CD
  • Built-in 5.7" TFT LCD Color Display
  • Stand-alone or PC-connected operation
  • High-speed Sampling
  • Analog channel isolation
  • 20mV to 500V full-scale measurements
  • Four alarm outputs
  • Optional battery pack
  • USB and Ethernet PC interfaces.
  • Programmable measurements per analog channel:
    • 15 voltage ranges over ±20 mV to ±500 V full scale
    • Type J,K,T,R,S,B,E,N,W thermocouples
    • PT100, PT1000 3-wire RTD
  • Four discrete/counter/frequency input channels
  • Four alarm outputs
  • Sample rates up to 100 kHz per channel
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GL900 Data Logger


With its color monitor and internal memory the GL900 is a self-contained, compact, lightweight, multi-channel data logger with 8 analog measurement channels, each with input-to-output and channel-to-channel isolation. Measurements per channel of 20mV to 500V FS across 14 programmable ranges allow the GL900 to adapt to a wide range of signal types, including thermocouple-based temperatures (K,J,E,T,R,S,B,N,W) and process current (4-20 mA). Up to four pulse channels can count and measure speed using an optional cable, and Humidity measurements are also possible with an optional sensor. The GL900 may be configured to trigger up to four different alarm outputs as a function of measured values.

The GL900 allows data to be recorded to internal high-speed volatile RAM memory (64 MB) at rates as fast as 100,000 Hz. The unit also provides built-in non-volatile memory (256 MB) and accepts external USB flash drives (2 GB maximum file size) for lower speed sampling as fast as 1,000 Hz. The minimum sample rate for all memory configurations is one sample per minute.

The GL900 features built-in USB and Ethernet ports to facilitate data transfer to a connected PC either in real time or from its memory for analysis and archiving. Measurement protocols may also be uploaded from the PC to the instrument. An optional battery pack allows power-independent operation and failsafe measurement continuity during a power failure.



BNC to Banana Jack

BNC to banana jack Adapter


BNC to banana jack Adapter. Safety insulated male BNC to dual 4mm banana jacks. For use with the GL900 midi Data Logger.


Power Cable

Cable and adapter kit for use with the GL900 Data Logger


DC power cable and adapter kit for use with the GL900 Data Logger.


2 Battery Packs

B-569 Graphtec Battery Pack


Two (2) 7.2V/2900mAh lithium battery packs. Only one B-569-2 is required to power the GL900. Please Note: Continental U.S. shipping ONLY.


Logic/Alarm Cable

B-513 Graphtec Logic Alarm Cable


2-meter logic/alarm cable with bare tips.


DC Power Cable

B-514 Graphtec DC Power Cable


2-meter DC power cable with bare tips.


Humidity Sensor

B-530 Graphtec Humidity Sensor


3-meter humidity sensor with dedicated power connector. Learn More.


Carrying Case

B-544 Graphtec Carrying Case


Carrying Case. Interior padding and rugged exterior for safe transportation of your data logger.


4-20mA Current Loop Shunt Resistor

$ 2.99
R250 Shunt Resistor


250 Ω ±0.1% Precision, Metal Film, 1/2W, Axial Resistor
Exceptionally low noise; typically 0.10 μV/V
Low voltage coefficient to ±5 ppm/V
Flame retardant coating. RoHS compliant. Learn More



File Conversion

FREE Graphtec to WinDaq High Resolution (GBD - to - WDH) File Conversion Utility (beta version) converts files recorded with a Graphtec device to WinDaq Playback for analysis.

Graphtec to WinDaq file converter

Graphtec Downloads

Data Logger Software

Visit the Support Download page at Graphtec for software (both links below take you to another site).

Graphtec Downloads


Graphtec Alarms

Learn how to set up an Alarm with Graphtec Data Loggers.
Graphtec Channel Configuration
Channel Configuration

Learn how to configure channels with Graphtec Data Loggers.
Graphtec APS Software Overview
Graphtec APS Software

APS PC-based software provides access to all the features on the front panel, and more.
Graphtec record at specified time
Record at Time

Learn how to record at a specified time with Graphtec Data Loggers.
Graphtec Snapshot of Display

Learn how to take a snapshot of the display with Graphtec Data Loggers.
Graphtec Statistics

Learn how to generate and view statistics with Graphtec Data Loggers.
Graphtec Triggered Storage
Triggered Storage

Learn how to setup triggered storage with Graphtec Data Loggers.
Graphtec Calculated Channels
Calculated Channels

Learn how to display calculated values in Graphtec Data Loggers.
Graphtec Display Engineering Units
Engineering Units

Learn how to display engineering units with Graphtec Data Loggers.