Peterson's tuners are among the most accurate available. This is the handy tiny version of the well regarded Strobe. Get it used while you can, they seldom come through our hands. 

Model: Peterson StroboStomp Mini
Made: China, 2022 approx
Serial: SSM-022868
Type: chromatic tuner
Power Input: standard 9v DC centre-negative (supply not included)
Accessories: original box and docs

Condition notes: used, no major marks. Tested and fully functional.
Overall: excellent condition (9/10)