HM Digital Handhelds - HM Digital TDS-4TMA Aquarium TDS Meter with Digital Thermometer
HM Digital Handhelds – Tagged "HM Digital TDS-4TMA Aquarium TDS Meter with Digital Thermometer" – Get Ultimate Now
Some companies call them pens (they don’t write) and others call them testers, but essentially they are handheld instruments that offer the user a portable quick spot check device for any field application. HM Digital’s handhelds are the most reliable easy –to-use meters on the market.