Features:Fast easy to read results with large digital LCD readoutExtreme accuracy to +/-0.02 pH and extended range (-2.00 pH to 16.00 pH)Lightweight and portableEasy measurement: just place the probe in the sample, gently stir and wait for the reading to stabilizeSimple push button, automatic two-point calibration for increased accuracyFood grade electrode with a rugged, easy-to-clean, PVDF body, a conical tip for use with semi solids with a screw on cap to ensure proper storageRugged stainless temperature probe3 feet probe cables for extra flexibility when testingAuto shut off and low power demand with approx. 300 hours of continuous use (battery included)ACCURACYPeople choose the PRO+ pH Meter to improve the accuracy of their pH testing program. With two point calibration, the meter can be quickly calibrated to a higher accuracy compared with one point calibration. The MW102 meter has accuracy to +/- 0.02 pH. 5x more accurate than some alternative meters.The meter comes with both a pH probe and temperature probe allowing the meter to automatically adjust the pH reading for the effect of temperature.The temperature probe can also be used as a very accurate thermometer.TOUGHNESSThe rugged meter is built to take knocks.SPECIALIZED DESIGN FOR PH ANALYSIS IN FOODMA920 food probe features include an open junction design that reduces clogging from suspended solids and proteins found in food and dairy products for a more stable pH measurement and reduced maintenance.The probe also has a conical shaped tip design which allows for penetration into solids, semi solids, and emulsions for the direct measurement of pH in a variety of food products.In addition, the body is constructed from polyvinylidene fluoride (PVDF). PVDF is a food grade plastic that is resistant to most chemicals and solvents used for disinfection in the food sector, including chlorine (bleach).pH meters usually start performing poorly because of problems with the probe. The two parts of the pH probe that cause problems are the glass sensing bulb and the reference junction.SENSING BULBThe glass bulb loses sensitivity with use and will eventually fail. This is true of all pH probes.REFERENCE JUNCTIONThe reference junction is a small hole that allows the meter to compare the sample to a reference. The reading is generated based on the electrical difference between the sample and reference. If the junction hole gets clogged, the pH electrode will no longer function.You can extend the life of your pH electrode in the following ways.CLEANING AND STORAGEAll pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH pen tester will give you fast, accurate results for longer. So, be sure to order the Milwaukee pH Maitenance Kit code PH-Main at checkout time! This will be needed to help clean and condition the pH electrode before use!STORAGEThe pH probe needs to be kept hydrated. Long periods of dry storage will damage the sensitivity of the probe. Allowing the probe to dry out may also result in the junction hole getting clogged.Storing in pH probe storage solution MA9015 or pH calibration buffers will help address both these issues. Do not store in tap water and DI water. This will damage the sensitivity of the probe.The best way to store the probe is with the probe's cap filled with storage solution or calibration buffer and the cap tightened to prevent leakage. It is also recommended that to store the electrode upright to further reduce the potential for leakage.CLEANINGResidue from the sample can impact the sensitivity of the sensing bulb and clog the junction. This is especially true if the sample has a lot of orga-nic material. We recommend regularly soaking your electrode in cleaning solution MA9016.CALIBRATIONThe pH sensing bulbs become less sensitive over time so make sure that you are calibrating regularly to keep your PRO Plus pH meter accurate. Also, calibrate after cleaning or a long period of storage.