Conductivity meters measure how well a solution can conduct electricity, this is useful in a lot of general and industrial applications. Conductivity varies with temperature and so conductivity meters have built-in temperature compensation and often have temperature measurement incorporated into the unit.
The main uses of a conductivity meter include water purification systems, boiler water, swimming pools, hydroponics (water gardening), monitoring public water quality, reverse osmosis deionization (RODI) units, fish tanks, testing well and spring water, hospitals, brewing and drink making industry. Although these are budget-priced instruments, they have been calibriated in a science lab for accuracy.

There are some great instruments for sale at the moment on Amazon, let’s take a look at our top five, beginning with number 5…

#5 Myron TDS/Conductivity/Salinity Pocket Pen


First we’ll take a look at the Myron TDS/Conductivity/Salinity Pocket Pen. This is a great little instrument suitable for many different uses that is fast, accurate and also very easy to use. This device is so easy to use that it makes taking your readings a pleasure, just press the button and dip into the water solution and you will get your reading out in a matter of seconds. If you are looking for portability and ease of use with a meter that can be operated with one hand then this is the choice for you.


#4 Hanna Instruments HI 98129 Waterproof pH/Conductivity/TDS Tester


Our second pick is the Hanna Instruments HI 98129 pH/Conductivity/TDS Tester, an excellent instrument that is both very easy to use and very accurate. Hanna is one of the most trusted names in measurement and this meter is no exception to their high standards. This high quality device is waterproof and will float on water. It’s ready for use as soon as you turn it on and you will get very accurate readings making it suitable for a whole range of applications. Unlike some other conductivity testers, the Hanna HI 98129 has replaceable electrodes – thus prolonging the life of the meter.


#3 YSI Pro30 Field Conductivity/Salinity/Specific Conductance/TDS Meter


Next up we feature the YSI Pro30 Field Conductivity/Salinity/Specific Conductance/TDS Meter which is expensive but is a serious bit of kit. One of the most rugged and reliable meters available on the market with an IP67 casing and a 1 metre drop test accreditation to give many years of service in any conditions. The YSI has a 4 electrode system for excellent stability in measurement making it the first choice for many professionals who need to depend on their kit to get the job done every time and can store up to 50 sets of data.


#2 Extech EC400 ExStik Waterproof Conductivity, TDS, Salinity, and Temperature Meter


The runner up in this section is Extech EC400 ExStik Waterproof Conductivity meter which comes highly recommended for industrial, commercial and domestic use. It measures salinity in both ppm (parts per million) and ppt (parts per thousand) depending on the levels in your solution and has an independent endorsement from a scientist on the sales page verifying the accuracy of the meter. Although this is an advanced piece oof equipment suitable for industrial applications, the price makes it available for household duties like checking salt levels in a swimming pool or monitoring the salt in purified water.

The package comes complete with conductivity cell, protective sensor cap and sample cup and batteries are included.

#1 HM Digital COM-100 Waterproof Combo Meter for EC, TDS and Temperature, 1-Pack


Our top pick in the conductivity meter section is the HM Digital COM-100 Waterproof Combo Meter, a versatile meter that is great for measuring electrical conductivity (EC), total disolved solids (TDS) and temperature. The meter is easy to use and set up, with push-button calibration and has a very useful “Hold” feature that lets you keep the reading displayed so you can read it when the meter is out of the water. So simple to operate, just switch the meter on and dip. You get an instant, accurate reading. Highly recommended!

It has a rugged waterproof housing, comes with a full one year warranty and batteries are included.