Koso Honda Grom Mini 3 Air/fuel Ratio Gauge

Koso's mini 3 air / fuel ratio for honda grom is designed to assist you to properly tune your engine and help you avoid engine problems. just connect the meter to the 12vdc power source and plug it to your o.e.m. oxygen sensor and you're ready to go! a/f ratio: display range: 12.2 ~ 17.2. display unit: 0.1. the a/f ratio is higher than 17.2, display will show -l-. the a/f ratio is lower than 12.2, display will show -a-. effective voltage: dc 12v. meter standard: jis d 0203 s2. meter size (wxlxh): 60 x 30 x 11.5 mm. meter weight: 22 grams.