Compare at $14-$20 a RollI have 19 rolls available. This QT-40 sanitizer test strip dispenser from DayDots includes 4 15 foot rolls of test paper and a color comparison chart. It measures 1, 150, 200, 400 and 500 parts per million.
KIPP & ZONEN BD40 CHART RECORDER - FREE SHIPPING! I bought this nice, bullet-proof chart recorder from the Virginia Tech surplus auction. The paper mechanism works properly but I don't have the means to test the pen mechanism.
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