pH pen for Test Tubes^ pH pen for standard test tubes 16x50 mm or larger. Comes with ATC, Range: 0 - 14, Accuracy: +/- 0.1, Designed for simple one-hand operation. Automatically calibrates to pH 4, 7 and 10 buffers, The case is IP65 waterproof, Probe: 120 mm +ù 12 mm, Dimensions: 245 +ù 35 +ù 22 mm
