Membrane O-Ring Kit (10 Piece), %sat/% Vol for Oxyguard Stationary D.O. Probe Gray Paper It is easy to write Thermometer Product:#6090-E - Sulfuric Acid, 0.5N, 15 ml 70480-S-BL seals 1940 L135 F

It is easy to write on this white strip with an ordinary ball-point pen

the user-replaceable AA battery provides approximately one to three years of typical operation

no membranes or electrolyte

Its wider mouth design enables faster tape deployment

It's compatible with the OAKTON 35634-42 CTSTestr™ 5 Waterproof Pocket Tester

Membrane O Ring Kit (10 Piece), %sat % Vol for Oxyguard Stationary D.O. Probe Gray Paper It is easy to write Thermometer Product:#6090 E Sulfuric Acid, 0.5N, 15 ml 70480 S BL seals 1940 L135 F It is easy to write on this white strip with an ordinary ball point pen the user replaceable AA battery provides approximately one to three years of typical operation