HM Digital TDS-3 TDS Handheld meter Tester + NaCl 342ppm calibration solution

TDS-3: Handheld TDS Meter with Carrying Case With its rugged design and build, the TDS-3 is an ideal meter (tool) that can be used for any application; Ranging from water purification, to hydroponics to industrial waste water treatment. It comes with a black vinyl carrying case, protecting it when carried in a toolbox. FEATURES: Hold Function Auto-off Function (After 10 min.) Built-in digital thermometer Includes a carrying case with belt clip Factory Calibrated with a 342 ppm NaCl solution. (Meter can be recalibrated with a mini-screwdriver).   C-342 : TDS and EC Calibration Solutions For optimal performance, re-calibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges. FEATURES: NaCl calibration solution, available in 342 ppm  Comes in lightweight HDPE plastic bottles Sealed with a coated foam liner