Testing Solution Refill (1995) for the RS Mizar M24 Gold Tester. Works only with RS Mizar M24 Gold Tester Replacement testing solution for RS Mizar M24 gold testers. Good for 50-60 tests according to the manufacturer. Manufacturer recommends to replace your testing solution every 6 months after opening. Please choose the LOKIT testing solution kit for Mizar M18 and ET18 testers.