Add to Cart Quick view Petrifilm® Rapid Coliform Count Plates, 50-pk MSRP: Now: $188.27 Was: Petrifilm® Rapid Coliform Count Plates, 50-pk Coliform colonies may begin to appear on the plate as early as 6 hours of incubation; coliform results in as early as 14 hours of incubation. ... 6402 MSRP: Now: $188.27 Was: Add to Cart Quick view Qty in Cart: 0 Order Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $188.27 Was: Subtotal: Add to Cart