RulerBlack Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Sort by editor review Added to wishlistRemoved from wishlist 0 Add to compare Jeffdad EKG Calipers ECG Calipers Measuring Tool Nursing or Doctor Caliper Divider for Measuring Drafting Electrocardiographs wif Ruler(Black) Added to wishlistRemoved from wishlist 0 Add to compare $6.49