I don't know exactly which ones my friend has but here's some on Amazon

Phoenix Systems 8006-B Double-Ended Coolant + Brake Fluid Test Strips (15 foil wrapped test strips), 1 Pack https://www.amazon.com/dp/B0753MZT7P/ref=cm_sw_r_cp_api_glt_fabc_68QWMMDPG1NKKNV1EB09?_encoding=UTF8&psc=1