High-accuracy data logger

The PT-104 is a four-channel temperature measuring data logger. It offers the ultimate in resolution (0.001 °C) and accuracy (0.015 °C). Along with temperature it can also be used to measure resistance.

PT-104 Specifications

Type Temperature Resistance
Sensor PT100, PT1000 n/a
Range –200 to +800 °C 0 to 375 Ω
0 to 10 kΩ
Accuracy (at 23 ±2 °C) 0.015 °C
+ 0.01% of reading
50 ppm at 100 Ω
Temperature coefficient 5 ppm/°C 5 ppm/°C
RMS noise with filter 0.01 °C 10 ppm
Resolution 0.001 °C 1 µΩ
Overload protection ±30 V
Number of inputs 4
Converter resolution 24 bits
Conversion time 720 ms per channel
Input connectors 4-pin mini-DIN
Input impedance >1 MΩ
Output connectors USB and Ethernet
PC requirements
Minimum Processor, Memory, Free disk space: As required by the operating system
Operating system: Microsoft Windows 7, 8 or 10, 32-bit and 64-bit versions; macOS 10.9 (Mavericks) or later, 64-bit only; Linux*, 64-bit only
Ports: USB 1.1

* PicoLog 6 for Linux is distributed as an AppImage, so you can install it without superuser permissions: see for further information. The software has been tested on Red Hat, OpenSUSE and Ubuntu.

Operating environment
Temperature range
Humidity range

0 °C to 70 °C (20°C to 30°C for quoted accuracy)
20% to 90% RH, non-condensing
Storage environment
Temperature range

-20 to +80°C
5 to 95% RH, non–condensing
Physical properties
Dimensions 184 x 135 x 36 mm  (approx 5.31 x 7.24 x 1.42 in)
Weight 350 g (approx 12.3 oz)

PicoLog Cloud

PicoLog Cloud data acquisition software can collect up to 1 million samples. Features include:
Multiple views — view data as a graph, spreadsheet or text
Parameter scaling — convert raw data into standard engineering units
Math functions — use mathematical equations to calculate additional parameters
Alarm limits — program an alert if a parameter goes out of a specified range
IP networking — transfer measurements via a LAN or over the internet
Operating systems supported — Windows, macOS, Linux or Raspberry Pi OS. For supported OS versions, see PicoLog 6 Release Notes.
PicoLog languages Simplified Chinese, Dutch, English (UK), English (US), French, German, Italian, Japanese, Korean, Russian, Spanish
PicoLog Cloud and PicoSDK Available from
Example code Available from Pico's GitHub organization page,
Optional free software Drivers for Linux and macOS
Documentation languages
User's guide
Programmer's guide
English, Français, Deutsch, Italiano, Español
Additional hardware (supplied) USB 2.0 cable, Ethernet cable, user manuals
PC interface USB 1.1 (USB 2.0 and USB 3.0 compatible) or Ethernet (with PicoLog 6 for Windows only)
Power requirements Powered from USB port or Ethernet
Compliance European EMC and LVD standards
FCC Rules Part 15 Class A
RoHS compliant
Total satisfaction guarantee In the event that this product does not fully meet your requirements you can return it for an exchange or refund. To claim, the product must be returned in good condition within 14 days.
Warranty 5 years