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BFS-250 COM-100 TDS/EC Meter - $59.95 COM-100 Measures TDS, conductivity, and temperature. Automatic Temperature Compensation. Waterproof housing. Measurement Range: 0-9990 µS; 0-8560 ppm (auto-ranging). Digital calibration (push button). Auto-off function, data-hold function and low-battery indicator. Large easy-to-read LCD screen includes. Factory Calibrated with 1413 µS solution. Includes cap, batteries, lanyard. EC Range: 0 - 9990 µS TDS Range: 0-8560 ppm (mg/L) Temperature Range: 0-80 °C; 32-176 °F Resolution: 0-99: 0.1 µS/ppm; 100-999: 1 µS/ppm; 1000-9990: 10 µS/ppm. Temp. resolution is 0.1 °C/F Accuracy: /- 2 EC to TDS Conversion Factor BFS-75 TDS3 handheld meter - $22.20 Check the function of your RO membrane and DI resin with this handy TDS3 (total dissolved solids) meter. Includes batteries. Comes precalibrated. Hold Function saves measurements for convenient reading and recording. Auto-off function. Measurement Range: 0-9990 ppm. From 0-999 ppm, in increments of 1 ppm; from 1000 to 9990 ppm, in increments of 10ppm. Built-in digital thermometer. Factory calibrated with 342 ppm NaCl solution; recalibrate with mini-screwdriver. Automatic temperature compensation. 3-yr manufacturer's warranty. BFS-420 TDS-EZ - $15.59 Includes Hold and Auto-Off functions. Measurement Range is 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1 ppm, from 1000 to 9990 ppm, the resolution is in increments of 10 ppm. Large and easy-to-read LCD screen. Factory Calibrated with a 342 ppm NaCl solution - can be recalibrated with a mini-screwdriver. Accuracy is /- 3 percent. Uses two 1.5V button cell batteries (included), which last for apx. 1000 hours of use. Best used with room temperature fluids. Measures 6.1 x 1.25 x 1 inches. BFS-251 PH-200 pH Meter - $79.95 PH-200 pH meter measures pH and temperature. Includes 4 pH buffer solution in a sponge embedded in a clear cap. Waterproof housing. Measurement range 0-14 pH. Digital calibration (push button). Auto-off, data-hold function and low-battery indicator. Large LCD screen. Three-point factory calibrated to 4, 7, and 10 pH. Includes cap, batteries, and lanyard. BFS-337 Replacement Probe for PH-200 - $36.90 A genuine HM Digital replacement probe for the PH-200 meter. BFS-278 ORP-200 Meter - $87.95 ORP-200 meter measures Oxidation Reduction Potential (Redox) and temperature. Includes 4 pH buffer solution in a sponge embedded in a clear cap. Waterproof housing. Simultaneous temperature display. Measurement Range: -999 to 1000 mV. Digital calibration. Auto-off function, data-hold function and low-battery indicator. Includes a cap, batteries, and lanyard.

Accessories Pumps Powerheads Chemicals Deionization Filters Specialty Filters Media Reactor Skimmer CO2 Filter Fittings Housings & Brackets Meters & Controllers RO Membranes RO Systems RO/DI Systems Storage Tanks Tubing Refractometers Value Series Premium Series Drinking water kit Residential Series Auto Shut Off Valves Faucets Float Valves Flow Restrictors Flush Kits Pressure Gauges Other Add-on DI kits, standard -size Add-on DI kits, jumbo Ammonia-Trap Cartridge Silica-Trap Cartridge DI resin, color changing DI resin, non-color changing Cation Resin Anion Resin Filter kits Sediment Carbon/GAC Refillable Cartridges Supply Fittings Valves Tees Elbows Straight/Males Straight/Females Bulkheads Nipples Barb Fittings Other/Miscellaneous Handheld Meters In-line Meters Controllers Accessories Residential Membranes 2.0 to 2.5 Inch Membranes 4 to 6 Inch Membranes 8 Inch Membranes Peristaltic Dosing Pump 1/4 Inch 3/8 Inch 1/2 Inch Value Series Premium Series Reef/Residential RO/DI System Chloramine Special Flouride Removal pH Boost Chlorine/Metals/Scale Removal Well Water Buddy Nitrate Removal Scale Prevention