YZXstudio USB-C Power Meter
The YZXstudio USB-C Power Meter was my first solo Taobao purchase, despite my limited Mandarin. It cost about S$33 plus S$6 shipping, but as a sensitive item it only ships by sea, taking nearly a month.
multimeter
USB power meters and multimeters.
Satechi USB-C Multimeter
The Satechi USB-C Multimeter retails for US$29.99 on Satechi's site but only US$22.95 on Amazon, both shipping to Singapore. I bought mine from the cheaper Amazon listing, shipping it via freight forwarder HopShopGo.
Legion Meter – USB Multimeter
The Legion Meter is a USB multimeter with an integrated OLED display, designed to accelerate your smartphone or tablet's charging by up to 92%. A multimeter combines several measurement functions in one unit, typically measuring voltage, current, and resistance.