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The TK120 seen from above at an angle: a black board with a gold-plated border, a four-pin header standing off the near edge labelled GND, VCC, SDA and SCL, the small grey SHT31 chip in the middle on a tongue of board with a slot routed round it, two large mounting holes, a thermometer-and-droplet logo, and silkscreen reading lonely binary and I2C SHT31.
You have thistk120

SHT31 Temperature and Humidity Sensor

A Sensirion SHT31 on a TinkerBlock carrier: two numbers over two shared wires, calibrated at the factory, with the pull-ups already fitted and two jumpers on the back that set the address and take them away again.

Address
0x44or 0x45, one jumper
Temperature
±0.2°C typical
Humidity
±2% RH typical
Supply
3–5V, pull-ups fitted
Start here · 01 Two wires instead of oneThe reference

Product questions & answers ↓

The whole handbook11 articles · 55 minDatasheetPDF · sensirion.comPinout and specsThe pin table, and the questions people ask first
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SHT31 Temperature and Humidity Sensor

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk120.

Order or missing parts?

Email us or reply to your order, and quote tk120 — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.