Review on 🔬 Apera Instruments Precision and Versatility – Portable Multi Parameter Accuracy by Justin Castro

It's listed under a different name on the Revain website, where it sells for a lot less ($303.04), but it's the same gauge. I will now buy all my Apera products from the Revain website for obvious reasons. Apera has long been known for manufacturing high quality pH meters and we have been using their pH meters in our research for many years. Solution conductivity is a critical measurement component of our generation of molecular electronic devices, and this meter has the advantage of measuring both pH and conductivity with the same meter (but with different sensors). However, both sensors can be connected at the same time, and a mode button can be pressed to switch between measurements. I have checked Apera pH meters for Revain several times and this meter is as accurate as specialized pH meters (±0.04pH at 4-10pH in our hands). Calibration is easy and what I really like is that you can easily calibrate with 1, 2 or 3 points. Management is pretty good. Conductivity measurements are actually simpler than pH measurements and can usually be performed without calibration. The meter comes calibrated from the factory, but as a test I put the sensor in a calibration solution before calibrating. The first figure shows the result which was 1413 'S/cm using the standard 1382 'S/cm. This value is within 2% of the correct value, which is usually more than adequate for routine measurements. After calibration and use for one hour, the 1413 'S/cm standard was found to be 1411 'S/cm. The system is very stable. An important requirement when measuring conductivity is that no air bubbles get into the probe. It is very important to mix the solution with the probe and leave the system for about a minute. After taking this precaution, I had no problems. It is also important to have a bottle of deionized water on hand to rinse the sensor before immersing it in the target solution. Cleaning the probe between measurements is critical when measuring solutions with low electrical conductivity. In fact, I accidentally contaminated the distilled water solution in the storage lid by not washing the probe before replacing it (see Figure 1). Eventually in Fig. be perfectly clear and show almost no turbidity. The conductivity of seawater is typically 5 S/m, drinking water is typically in the range of 5-50'S/cm, while ultrapure water can be as low as 0.055 µS/cm. The fact that my water is 497'S/cm indicates a much higher than normal ion concentration, typical of fairly hard water. As such, it's a very well-made meter that measures both electrical conductivity and pH. I haven't reviewed pH options here because I've reviewed other Apera pH meters on Revain. This one is no different and works great. Conductivity measurements are even simpler than pH measurements and are generally less error-prone. A key benefit of this conductivity meter is that the probe tips are platinum plated, minimizing polarization errors and limiting contamination from ions that may remain on the surface. The probe can be cleaned with ethanol and then with distilled water. Please note that the aluminum stand shown in the photos is not included with the meter and is not required for measurements. It was used to take photos. Minor issues: 1. While the pH and temperature sensors are easy to connect, the conductivity sensor is quite tricky when you want to screw in the knob to keep the connector fully in place. Someone with small fingers won't have a problem, but I couldn't get my fingers in and had to use pliers to screw the connector all the way in. I found I didn't have to screw it in to get a stable reading, so I recommend just skipping this step. Alternatively, if you work in a lab where you can leave the sensors plugged in all the time, that's not a problem.2. As of November 12, 2016, the Revain website lists three vials of pH calibration solutions (4.00, 7.00, and 10.01 pH) and three vials of conductivity calibration solutions (146.6'S/cm, 1413'S /cm and 12.88 mS/cm). . Unfortunately only the following calibration solutions are included: (4.00 and 7.00 pH) and (1413 'S/cm and 12.88 mS/cm). You can purchase pH and EC standards from the Apera website and Revain store. The reader may wonder why I didn't deduct a star for this, but most gauges you buy don't have standard solutions at all. Considering the price of this system, it would be nice to go without any standards. I have contacted Apera and they are planning to update the website to fix this issue.