Hach Glass Viewing Tube, 6/pk, 173006By Hach $35.55 | PK Quantity discounts available QuantityPrice Product #: 700011Mfr. Part #: 173006 This item is in stock Quantity -+ Add to Cart Free Ground Shipping On All Orders Over $1500!*Terms and Conditions Apply* Details Description Glass viewing tubes contain 5 mL mark. DetailsBackDescription Glass viewing tubes contain 5 mL mark.