The DM-2 is a commercial grade TDS meter that will help monitor the water feeding into your RODI system, as well as the output of the RODI filter for any impurities, so you know if a carbon block, the DI resin, or TFC membrane needs to be switched out, ensuring your aquarium water is as pure as it can be.
Its shielded cables, along with diagnostic messaging, the DM-2 also works nicely within applications such as drinking water, forms of water treatment, hydroponics, and other uses.
|Range:||0-9990 ppm Dual Range – Measures from 0-999 ppm, with a resolution of 1 ppm. From 1000 to 9990 ppm, the resolution is in 10 ppm increments, indicated by a blinking `x10` image|
|Conversion Factor:||NaCl (avg. 0.5)|
|Cable Length:||46" (including sensor), shielded cables|
|Sensor:||Dual, 1/4" diameter for quick-connect fittings (model SP-3, included)|
|Digital Calibration:||Digitally factory calibrated to NaCl 342 ppm. Re-calibration can be done separately for each line.|
|Power source:||2 x AA batteries (included)|
|Battery life:||2 years, approximately|
|Dimensions:||4.6" x 2.6" x .7" (11.6 x 6.8 x1.8 cm)|
|Weight:||201.3 g (7.1 oz.)|
HM Digital, Inc.
Established in 1987, HM Digital, Inc. (formerly known as Heemang Electronics) is an original equipment manufacturer (OEM) that has been recognized worldwide for providing the best values in water testing instrumentation, especially the increasingly popular TDS meter.
Most orders under $29 ship for only $2.99 using a mix of economy shipping methods including UPS Ground, USPS First Class, and/or SurePost. Your order will be delivered in 1-7 business days after it ships out.
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in 1-7 business days. Just spend $29 or more!
Over 90% of shoppers receive their orders within 2 business using UPS Ground. Upgrade from free economy shipping to UPS Ground for only $2.99—or spend $250 and we’ll upgrade you automatically!
Expedited shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.
Same-day shipping is available Monday-Friday for most products—place your order by 10:30 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
We ship live plants, live foods, and frozen foods within the contiguous United States. Each of these categories is subject to its own $19.99 flat-rate shipping fee to cover the special packaging and/or expedited shipping costs required to ensure safe delivery. Orders with 12+ live plants ship free!
Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.
A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.
Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.
Rack up reward points to earn discounts on future purchases! You can earn reward points by creating an account, writing reviews, referring friends, subscribing to our newsletter, buying products, and more!
You can also get bonus reward points by purchasing select items during special sales and promotions.