AUTO REF/KERATOMETER ARK-1s
There is possibly a difference between the measured dioptric value of the subjective measurement mode and the objective measurement mode on ARK-1s.
Distributed domestically to AK, AL, AR, CA, CO, DE, FL, GA, ID, IL, IN, MD, MI, MO, MT, NM, NY, OH, OK, PA, SC, TN, TX, VA, WA, WV.
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-1348-2018