The TK119 seen from above at an angle: a small black board with a gold-plated edge, a black two-way screw terminal marked LOAD beside a red one marked POWER, a large rectangular shunt resistor between them under two arrows, two big mounting holes, and a four-pin right-angle header labelled GND, 3V3, SCL and SDA.

You have thistk119

TK119 INA219 Current and Voltage Monitor

A 100 milliohm resistor in the positive wire and a chip that reads the millivolts across it. Current, voltage and power over I²C, up to 3.2 A on a rail of up to 26 V.

Full scale: 3.2A, widest setting
Rail: 0 to 26V
Supply: 3 to 5.5V
Address: 0x40one of four

Start here · INA219 Current Monitor The reference

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DatasheetPDF · ti.com Pinout and specsThe pin table, and the questions people ask first

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TK119 INA219 Current and Voltage Monitor

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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.