Top 10 Best HM Digital Digital Pens
for June 2023

The HM Digital PH-meter PH-80 is by far the best portable water tester we tested. The test range is precise and the ATC ensures accurate readings. Water resistant means you can take it anywhere, and the ergonomic design makes it comfortable to hold.

This portable water tester allows you to quickly perform total dissolved solids (TDS) tests and measure conductivity.

Our top choice for a portable TDS tester, the AP-1 AquaPro can measure from 0 to 5000 ppm, and has a calibration button that adjusts for temperature.

EC Meter EC-3M Digital Electrical Conductivity Tester is a portable very handy solution for measuring solids and liquids electrical conductivity.

The AP-2 Digital Tester is user-friendly, easy-to-use, and more accurate than meters costing several times as much. Its waterproof housing, digital calibration, and subscription to testing protocols make testing faster and more efficient.

This handheld TDS meter is easy to read and measures up to 9990 ppm. It's also very lightweight and durable.

The HM combo meter is one of the best meters at providing value. It gets the job done, and it does it well.

This digital TDS meter is perfect for hydroponics, aquariums, swimming pools, drinking and brewing systems. It displays a reading in seconds with the + & - button, which means you can use it for general testing, as well as precise testing.

The unique in-line sensor design makes this tester very convenient. The buoyant design ensures accurate readings. Lots of model options cater to different uses. Readout accuracy is +/- 2 percent, which is better than what we found with most other testers. Our testers found the HM Digital DM-2 overall to be a very good digital in-line TDS monitor. (source: cpponline.com)

The HM Digital SP-P2 Replacement PH Sensor for PH-200 is an affordable and easy solution for upgrading your PH-200 water meter.