The easy to use Checker plus is a real favourite with fishkeepers and aquarists due to its clear LCD display and long thin pH electrode. The checker offers automatic calibration and buffer recognition, calibrated buffer tags, stability indicator, low battery indicator and selectable automatic shut off. Ideal for measurements in test tubes and vials. Sturdy compact meter designed for direct sample testing Fast accurate readings from 0-14 pH with a resolution of 0.01 pH Thin long-reach pH electrode designed to fit easily into a test tube Replaceable pH electrode Economical Highly accurate Large LCD Stability indicator Automatic shut-off Plastic carry case One or Two point automatic calibration is simple to perform. The calibration buffers are automatically recognised and after calibration the buffer values used are shown on the display as a tag. Your meter will require maintenance solutions, whether it is cleaning, buffer/calibration, storage, conductivity standards etc., solutions are available in a variety of sizes. Check whether the solution you require is available in 1 gallon, 500ml, or 230ml bottles, or individual 20ml sachets.Hanna recommends the following solutions for this meter: Buffers pH4, pH7 & pH10 Cleaning solution Storage solution Specifications Range pH 0.00 to 14.00 pH Resolution pH 0.01 pH Accuracy pH ±0.2 pH Calibration automatic, 2 points Electrode HI 1271 (included) Battery Type / Life CR2032 Li-ion/ approximately 1000 hours of continuous use Environment 0 to 50°C; RH max 95% Auto-off 8 minutes Dimensions 50 x 174 x 21mm Weight 50 g