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Terms and Conditions: This promotion is open only to customers in the USA and Canada who purchase Ross pH electrodes and buffers in a single purchase order. Offer valid for qualifying orders received no later than April 30, 2018 or until promotional supplies are depleted, whichever comes first. Limited to 1 free Ross pH Buffers Kit per customer. Cannot be combined with other discounts or promotions. Offer void where prohibited, licensed or restricted by federal, state, provincial, or local laws or regulation or agency/institutional policy. Other restrictions may apply.