ECG / EKG Medical Grade Recording Chart Paper, Roll, Red Grid, 50x100, Medical Grade Recording Chart Paper Equivalent to: Spacelabs 305240 Fits Spacelabs models 400 and 500 Series (sold by the roll, 50 rolls per case) Availability: Usually ships the same business day Spacelabs 305240 equivalent A18549D$1.02 Copyright 2006-2011, A1cardiology.com