New HM Digital COM-300 Waterproof Professional Series pH/EC/TDS/Temp Meter With Case The COM-300 is a professional grade level pH/EC/TDS/Temp meter ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs scientific testing, pools spas, ecology testing, boilers cooling towers, water treatment and more. FEATURES: Measures Potential Hydrogen (pH), Electrical Conductivity (EC), Total Dissolved Solids (TDS), Salinity and Temperature Five scales: pH, µS, mS, ppm 0.5 (NaCl) Scale 0.7 (442?) Scale Automatic Temperature Compensation (ATC) using three temperature coefficients Waterproof housing (IP-67 rating) Digital Calibration (push button) to any point within the meter?s range Auto-off function, data-hold function and low-battery indicator Display: large and easy-to-read LCD screen includes simultaneous temperature reading Replaceable Sensor (model SP-CP) Factory Calibrated (pH/EC/TDS) Includes translucent cap, 2 (AAA) alkaline batteries, pH 4 7 calibration solutions, pH storage solution and lanyard Product Description pH Range: 0 ? 14 pH EC Range: 0 ? 9990 µS; 0 ? 9.99 mS TDS Range: 0 ? 8560 ppm (0.7 Scale); 0 ? 5000 ppm (0.5 Scale) Temperature Range: 0-55 C; 32-130F Resolution: 0-99: 0.1 µS/ppm/ 0.01mS ; 100-999: 1 µS/ppm; 1000-9990: 10 µS/ppm. Temp. resolution is 0.1 C/F Accuracy: +/- 2% EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by the user. Probe: Detachable platinum electrodes pH glass sensor with reference tube electrodes Housing: IP-67 Waterproof (submersible; floats) Power source: 2 x Triple A (AAA) included Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) Weight: 101.5g (3.6 oz) 442 is a registered trademark of the Myron L Company. Free Shipping rates apply to the lower 48 contiguous states. Contact Us to get shipping cost to your area if not in the lower 48 states before purchase. We ship all items discreetly Whether you are a novice gardener or a mad scientist in the greenhouse, you will find a plethora of inventory and knowledge at the Spokane Organic Hydroponic Supply centers. Our first store opened its doors in 2006 when Paul and mother Susan, both avid and life-long gardeners, joined together to share their passion and gardening experiences with the Spokane community. In 2010, Susan moved on to pursue other endeavors while Paul continued to expand the business. Each of our two stores employ experienced staff members with traditional garden expertise and modern industry knowledge. With real-life experiences, our plant experts know the challenges of outdoor and year-round gardening and strive to help customers eliminate avoidable mistakes. Our alternative and earth friendly stores we have created will leave you with a sense of empowerment to develop your own efficient methods of growing and caring for plants. We look forward to your visit and hearing the plant stories you have to share with us! We ship daily Monday - Friday. All orders will be shipped within 3 to 5 working days. Most will go within 24 hours. You will automatically receive a tracking # via email once we have shipped your order. All domestic orders will be shipped by UPS, Fedex ground, USPS priority mail or USPS ground. If you need to use a special carrier i.e. PO BOX w/ USPS, please email us and let us know. We will only ship to the address provided during payment. We are not responsible for any packages that are lost or damaged if insurance is not purchased. Shipping and handling rate is fixed and non-refundable. Free Shipping rates apply to 48 contiguous United States. Contact us for shipping cost to your area. No returns No returns are accepted on any nutrients and fertilizers Be sure the item is what you want because of the no return policy Pictures may be different then product sold We ship all items discreetly Satisfaction : Discreetly labeled, Professionally packaged, shipped as fast as possible with care read the feedback for proof. Our prices are competitive but the service is Priceless! We know how to ship liquids with no leaks and 100% satisfaction guaranteed. Your satisfaction is very important to us! If you have any problem with your order, please do not leave negative comments. Please Contact us ... we will help you out! In the unlikely event that the item is sold out from our stock or on back order, we will contact you to see if you want to wait a few days or we will refund 100% of your money. YOUR choice. Occasionally items sell from our brick and mortar store front before we are able to pull down our listing or adjust quantities. We try our best to fulfill these orders in a timely manner if possible. These cases are very rare, we will let you know as soon as possible and refund your money.