Greisinger Laboratory Equipment Reagent 623443 - Greisinger 610888, The Greisinger GKL-101 Reagent, manufactured by Greisinger, is a testing fluid used for environmental testing. It is identified by part number 610888 and is available as 1 piece per package. This reagent is essential for accurate calibration and assessment in various scientific applications. Greisinger 610888 GKL-101 Reagent 1 Piece Precise Testing Solution