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No meter warm-up is required with the (D)issolved (O)xygen 100 meter (46880-00), allowing you to take dissolved oxygen readings right away.
Accuracy is ensured with independent 100% and zero adjustment calibrations, and offset adjustment capabilities. Can store and recall 16 DO readings with corresponding temperatures, making it ideal for fielding readings. You can key in salinity and pressure manually and the meter will automatically calculate offset values. The dual display shows mg/L(ppm) or % saturation plus temperature. Comes with electrolyte solution and batteries.
The waterproof TDS 400 (46877-00) reads TDS in ppm, KC1, NaC1 or 442. Range: 0.00 to 9.99, 10.0 to 99.9, 10.0 to and 100 to 200 ppt. Both meters require 4 "AAA" batteries.

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