Aqua Master Tools P160 Pro2 Combo Pen — pH, EC, TDS, PPM & Temperature Meter

The Pro2 upgrades three things over the original P160 Pro: it runs on standard AAA batteries instead of button cells, the display has been changed to a black screen with white characters for significantly improved readability under grow lighting, and the EC calibration has been updated from analogue to digital — meaning it can be performed at any temperature without needing the calibration fluid to be exactly 25°C. The measurement range and accuracy specs are the same across both models.

Yes — the P160 Pro2 ships in a robust carry case that includes the meter, AAA batteries, pH 4.01 calibration solution, pH 7.00 calibration solution, and EC 1413 calibration solution. It's the most complete out-of-the-box package in the Aqua Master pen meter range, and one of the main reasons to choose the P160 over the P110 if you don't already have calibration solutions on hand.

Both measure pH, EC, and temperature. The P160 Pro2 adds TDS and PPM readings and comes with a carry case and calibration solutions included. The P110 Pro2 is the more compact, pared-back option for growers who only need pH and EC — it costs less and does not include a case or calibration fluids. If you want the full picture in one device and value the included accessories, the P160 Pro2 is the better choice. If you just need pH and EC covered and already own calibration solutions, the P110 Pro2 is a solid option at a lower price point.

The P160 Pro2 uses the 700 PPM scale, which is the most common scale used by Australian nutrient brands and hydroponic equipment manufacturers. If you're following a feeding schedule that references 500 PPM scale values, multiply those numbers by 1.4 to get the equivalent 700 scale reading. If you're unsure which scale your nutrient brand uses, check the feed chart — it's usually noted in the fine print.

No — the P160 Pro2 uses a dry storage electrode, which means you can store it dry between uses without filling the cap with KCl solution. Rinse the electrode after use, dry it carefully, and replace the protective cap. This makes it considerably lower maintenance than single-parameter pH pen meters that require wet storage to keep the glass membrane active.

Yes — this is one of the key advantages of the digital EC calibration system on the P160 Pro2. Because the calibration is not temperature-dependent, you can use any standard EC calibration fluid at any temperature. The included EC 1413 solution works well for the range growers typically operate in. When you need to restock, any quality EC 1413 calibration solution from a reputable brand will do the job.

At a minimum, once per month — the meter's built-in 30-day calibration reminder will prompt you. For high-value crops or critical grow cycles, calibrating weekly is not excessive. An uncalibrated meter gives you false confidence, which is worse than no meter at all when you're making feed decisions based on the reading.

The meter is covered by a 1-year warranty against defects in materials and workmanship from the consumer purchase date. The electrode carries a separate 6-month warranty. Proof of purchase is required. Physical damage, misuse, dirt ingress, and damage from third-party parts or unauthorised repairs are not covered.