Oxygen meter Starter 300D provides accurate and reliable data on the concentration of dissolved oxygen, which is extremely important for the life of aquatic organisms and water quality control. Indication of the accuracy of the calibration process on the display; displaying the results in ppm, mg / l and% by pressing the button; the galvanic electrode is ready for operation right after power-on; intuitive software; compact, ergonomic design and low weight for ease of use in the field, and the swing-out support allows them to be placed on a laboratory bench ; five control buttons with clear function markings; IP54 protection; there is a dedicated area on the body for applying identification labels; memory for 30 measurement results; temperature compensation - automatic or manual; atmospheric pressure measurement range, mbar - 500 - 1100; measurement resolution atmospheric pressure, mbar - 1; correction for salinity, ppt - 0.0 - 50.0; power supply - 4 × AAA, more than 250 hours of operation; measurement range,% - 0.0 - 199.9; 200 - 400; resolution,% - 0.1 / 1; accuracy,% - ± 1; calibration by one or two points; < / li> dimensions (W × D × H), mm - 90 × 150 × 35; weight, kg - 0.18. Electrode for measuring dissolved oxygen STD011: measurement range,% - 0-200; operating temperature range, ° C - 0.0 - 50.0; electrolyte - 10% NaCI storage solution; body size, mm - 120 × 12; cable length, m - 1.1; < li> connector - BNC. Temperature sensor STTEMP30: operating temperature range, ° C - 0 - 100; connector - Cinch; body size, mm - 120; cable length, m - 1. Scope of delivery: ST300D oxygen meter, IP54 seals, electrode holder, hand strap and 4 AAA batteries, STDO11 galvanic dissolved oxygen sensor and STTEMP30 temperature electrode.