Excellent, perfect to measure low-power devices, such as microcontrollers (ESP32). Also to check USB charger protocols, voltage stability, etc. Very good device, I recommend! You can find manual and firmware updating software on fnirsi.cn /support - I have updated to 1.60. I have bought it for 13 EUR, now it is 19 EUR, you can buy newer FNB48 for this price.
Item was slow in shipping but satisfied overall with item so far.