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 Ă— 12 mm, Dimensions: 245 Ă— 35 Ă— 22 mm
That provides accurate measurement of pH, oxidation-reduction potential(ORP), conductivity, salinity, and total dissolved solids (TDS).Starter pen meter are the economical option,Simple Operation in a Slim and Portable Design