LabJack T4
The LabJack T4 is LabJack’s lowest-cost T-series DAQ: 4 high-voltage ±10 V inputs, 8 flexible lines that work as 0 to 2.5 V inputs or digital I/O, two 10-bit analog outputs, USB and Ethernet, and on-board Lua scripting. LabJack recommends it over the older U3 for hobby, education and light industrial monitoring.
Specifications
| Analog inputs | 124 high-voltage (±10 V) plus 8 flexible lines (0 to 2.5 V) that can be analog or digital; single-ended only |
| Resolution | 12-bit |
| Max sample rate | 50 kS/sstream mode, shared across channels |
| Input ranges | ±10 V (AIN0 to AIN3), 0 to 2.5 V (AIN4 to AIN11) |
| Input modes | single-ended |
| Analog outputs | 2 × 10-bit |
| Digital I/O | 16 |
| Counters | 10 |
| Isolation | No |
| Interfaces | USB, Ethernet |
| List price | $305labjack.com, Oct 2026 |
Vendor driver by OS
| Driver | LJM |
| Windows | Yes |
| macOS | Yes |
| Linux | Yes |
Vendor software
| Kipling | Windows, macOS, LinuxFree. Configuration, test and firmware updates for T-series devices |
| LJLogM | WindowsFree. Command-response logging |
| LJStreamM | WindowsFree. Stream-mode logging |
Analog inputs on the T4
The T4 has one 12-bit SAR converter and two front ends. AIN0 to AIN3 are high-voltage inputs with a ±10 V range. AIN4 to AIN11 are flexible lines with a 0 to 2.5 V range that you can switch to digital I/O one at a time, so the T4 tops out at 12 analog inputs or 16 digital lines depending on how you split them. All inputs are single-ended, and LabJack’s comparison table does not rate the T4 for direct thermocouple or load cell connection. Those jobs go to the T7 or a signal-conditioning accessory. Stream mode runs at up to 50 kS/s shared across channels.
Outputs, digital features and scripting
The two DACs are 10-bit, 0 to 5 V. LabJack’s product page describes them as 12-bit, but the T-series datasheet’s DAC table gives 10 bits for the T4 and 12 for the T7, so plan on 10. The digital lines support LabJack’s DIO extended features: PWM output, counters, frequency and period measurement, and quadrature decoding. Lua scripts run on the device, so a T4 can run logic on power-up with no host attached.
Software on Windows, macOS and Linux
The T4 uses LJM, LabJack’s free cross-platform library for Windows, macOS and Linux, and Kipling, the configuration and test app, runs on all three. LJLogM and LJStreamM, LabJack’s logging apps, are Windows only. The list price is $305 at the time of writing. LabJack T7 on a Mac covers the LJM setup, which is the same for the T4. DAQAtlas, which is in development, supports the T4 through LJM, which you install from LabJack.
Questions
Does the LabJack T4 work on a Mac?
Yes. LJM, LabJack’s driver library, supports Windows, macOS and Linux, and Kipling runs on all three. LJLogM and LJStreamM are Windows only.
Are the LabJack T4 analog outputs 10-bit or 12-bit?
LabJack’s T-series datasheet lists the T4 DACs at 10-bit resolution with a 0 to 5 V range; the T7 has 12-bit DACs.
Can the T4 measure differential signals?
No. The T4 inputs are single-ended only. The T7 supports differential inputs and gains down to ±0.01 V.
Specifications and prices are taken from the vendor’s published pages at the time of writing and can change. Check the vendor before you buy. Sources: 1 · 2 · 3 · 4 · 5 · 6