LAQUA-PC1500-SR Meter Kit Horiba - pH - ORP - COND - RES - SAL - TDS meter with 9625-10D refillable, plastic body pH electrode, 9382-10D conductivity probe, pH 4, 7, 10, 3.33 KCL, 84μS, 1413μS, 12.88mS (250 ml each)