| | |  | Water Purification & Testing | Home » » HM Digital TDS-4 TDS Pocket-Size Meter | | | | | | | Description: | | A TDS tester that's ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver. Perfect for both consumer or commercial use. Carry one in your pocket at all times! .. The smallest and lightest TDS meter on the market. .. Sleek design is perfect for personal or consumer use. ... Hold Function: saves measurements for convenient reading and recording. .. Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries. ... Measurement Range: 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, indicated by a blinking 'x10' image. ... Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. | | | Features: | |
• Range: 0 - 9990 ppm (mg/L) ... Resolution: 1 ppm .. Accuracy: +/- 2%
• ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees C (33 to 122 deg F)
• Power source: 2 x 1.5V button cell batteries (included) ... Battery life: 1000 hours of usage
• Display: large and easy-to-read LCD screen. .. Advanced microprocessor technology.
• Manufacturers 3 Year Warranty
| | | Product Details: | | | Product Length:
| 5.51 inches | | Product Width:
| 0.91 inches | | Product Height:
| 0.59 inches | | Product Weight:
| 0.07 pounds | | Package Length:
| 6.0 inches | | Package Width:
| 2.5 inches | | Package Height:
| 0.4 inches | | Package Weight:
| 0.35 pounds | | Average Customer Rating:
|  based on 50 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
 ( 50 customer reviews )
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Most Helpful Customer Reviews
50 of 53 found the following review helpful:
 Seems accurate, good infoJun 15, 2009
By Nat Arem
I've used this on a few sources since buying it a few weeks ago.
Suburban Philly tapwater: 230 ppm
Same water but filtered by the fridge: 200 ppm
Dasani: 30 ppm
Grand Cayman tapwater: 175 ppm
Le Bleu delivered water: 0 ppm
Needless to say I was shocked by the Le Bleu but it really re-enforced the value of paying for purified water. I know the Dasani might actually have some good things in it (magnesium, potassium, etc) but I would definitely recommend getting a tester like this and finding a way to get water (delivered, RO filter, etc) which is pure. It's a small price to pay to independently verify the purity of the water you're drinking.
27 of 28 found the following review helpful:
Must have item!May 21, 2007
By Denis Stenderchuck
I live in area with contaminated water by industry and very old water system.I'm using charcoal water filter for water cleaning which require regular cartridge replacement. Thanks to this device I'm able to judge if it's time to replace filter, as in beginning TDS level of tap water and filtered one differ, but approximately after one month of use readings become almost same.
31 of 33 found the following review helpful:
It seems to workNov 27, 2008
By C. Schmidt
It seems to work.. I have no way to gauge if it is truly accurate. :) However, when testing a water source before and after it entered our RO filter, it clearly showed that the RO filter was working. Have had this for about 4 months now and it has worked fine w no battery problems.
It is good that it has a button to save your reading until you take it out of the water. Without that, sometimes it's hard to read the display while the meter is in the water container.
18 of 20 found the following review helpful:
 Compact pen-style TDS meter with hold featureFeb 13, 2009
By Gordon M. Wagner
Functions well, compact size. The hold feature is essential. Excellent price. No complaints. I am surprised to find out how clean (or unclean) various water sources are. I bought this to monitor our under-sink Reverse Osmosis filtration setup. Clean water is wonderful, this meter lets you know how pure your water is.
11 of 11 found the following review helpful:
TDS Meter saved me about $100Nov 10, 2010
By Alexander Lew
I have a reverse osmosis water system for drinking water that's about 3 years old. I was about to replace the filters because the manual says to replace them every 3-5 years. Good thing I ordered this $25 tester. It's about the size of a highlighter pen, has a clear number display, and is super easy to use. You test the water out of the tap then test the water out of the RO system. Divide the RO number by the tap number to get a percentage. As long as it's under 20% you don't have to change the membrane filter. My percentage was 5%, which means I've probably got a few more years before I need to change my membrane!
See all 50 customer reviews on Amazon.com
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