The Aqua Master Tools H600 Pro is a handheld meter that reads pH, EC, PPM, TDS and temperature through two separate probes on cables. It's built for growers who test often, test several tanks or carry a meter between grow room, greenhouse and shed.
The separate probes are the main reason to choose it over a pen. pH electrodes wear out faster than EC electrodes. On a combo pen, one worn sensor means replacing both. On the H600 Pro, each probe is replaced on its own, so running costs stay lower over the years.
PPM is worked out from EC, and meters don't all use the same conversion. The H600 Pro uses the 700 scale. Some feed charts and meters use the 500 scale, so the same solution can show two different PPM numbers. Check which scale your chart uses, or work in EC, which is the same on every meter.
The meter reads pH 0.1 to 14.0 to ±0.1 and EC 0.0 to 19.9 mS/cm, with automatic temperature compensation from 0 to 50°C. PPM readings top out at 1,999, around EC 2.8 on the 700 scale. Above that, switch to EC.
The probes are IP67 waterproof, but the meter body is IP62, which means splash resistant, not submersible. Keep the meter out of the tank and let the probes do the dipping.
It also accepts Aqua Master Tools substrate electrodes. Fit them and you can test directly in coco, soil or compost as well as in liquid. If substrate testing is your main job, the H600 Pro Handheld Substrate Meter comes with those probes already fitted.
If you only need quick pH and EC checks of one tank, the P110 Pro2 Combo Pen does the job for less.
Order online for delivery in plain, unbranded packaging, or use free Click & Collect from your local GroWell shop. Free UK delivery on orders over £99, and Pay in 3 if you'd rather spread the cost.
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