Joyo JF-18R Power Tune
In an appeal to the two-for-one shopper, Joyo’s JF-18R adds eight 9V DC outputs to a fairly basic tuner with decent specs. Forget about calibration and other features you’d expect from an ordinary tuner at this price.
Manufacturer Joyo
Joyo
Joyo Technology specializes in R&D, manufacturing and marketing digital products for music education. Its products include effects pedals, guitar amplifiers, tube amplifiers, metronomes, tuners, EQ systems, power supplies and various accessories.
2/F Lushi Industry Building 28th District Bao’an, Shenzhen, 518101 China
+86 755 2976 5381 (China)
+86 755 2976 5381 
Joyo JF-326 Irontune
Joyo’s mini tuner is very small (only Hotone’s Skyline Tuner is smaller), solid and basic. It offers excellent detection accuracy, true bypass and a somewhat useless flip-top lid.
Joyo JT-305
Contrary to Internet lore, Joyo’s JT-305 is not a clone of or identical to Korg’s Pitchblack tuner. And while they are quite similar, the Pitchblack offers better low-end note detection and a three-year warranty.