McKesson Urinalysis Microscope Slide Plain (1179435_BX) 100/BXProduced from optically clear acrylic Ten chambers, each holding a standard volume of 6. 3 L Within each chamber, there are 18 circles that are all together visible at 100x magnification. These premeasured circles contain specific volumes of urinary sediment within its circumference that allows for the easy calculation of cellular elements present in 1 mL of urine.