Swiff Audio C20 Pedal Tuner

This tuner is tiny!...this is why i bought it
Its metal with a weird coating thats like smooth rubber but feels a solid wee pedal none the less.
Works on 9v no battery as its too small but this is expected for its tiny size.
Tuning is simple as it tells you the string your on and it has red leds which turns to a green one when in tune but its quick to move so takes a few shots to get used to it.
Its true bypass and when engaged it totally cuts the fuitar signal which i tested on an amp at full volume so no signal bleed.
The question is it accurate?
I tested this wee tuner against my korg strobe tuner by tuning with the c20 first then checked tuning on my strobe and it was bang on every string so its staying on my pedal board and got rid of my tc polytune noir 2 which went on ebay so yeh real happy with this tiny tuner and it takes up no room on your board as its only 4cm square