**Pinpoint pH Meter Kit - Lab Grade Portable Digital pH Tester with 8-Piece Set for Precise Water, Soil & Aquarium Testing** *Perfect for Hydroponics, Swimming Pools, Home Brewing & Scientific Labs*

Good unit, easy to use, large display. Easily calibrated using the 7.0 and 10.0 calibrating solutions that come with it (will require a small eyeglass screwdriver to adjust). Buttons give good tactile feedback, probe appears to be of decent quality.Can be left immersed (I have mine in an aquarium). If you store it, make sure to keep the probe immersed in the bottle it comes with probe storage solution.As with all pH meters, the probe is fragile and shouldn't be allowed to dry out, so read the directions on storage, care and use.Would order again...solid unit for my use (aquarium). I recommend buying the extra box of calibrating solutions to make sure you calibrate every couple months. Unit has run more than 48 hours and battery still going strong.