Oakton? Conductivity, TDS and Salinity in one meter. Expanded 4-digit, dual-line display shows conductivity and temperature readings simultaneously. Additional key provides an easier, more intuitive interface. Improved cap functions as a sample cup and as a stabilizing base to stand the meter upright. Rugged IP67-rated housing is waterproof and floats. Battery level indicator flashes when battery is low. Batteries are included. Conductivity accuracy: 2% full-scale 1 LSD. TDS accuracy 2% full-scale 1 LSD. Salinity accuracy 2% full-scale 1 LSD. Temperature accuracy 0.9ø F (0.5ø C) 1 LSD. Waterproof design.