The 8100 Plus meter measures pH and temperature, and features a large, easy to read LCD display. pH range is -2 to 16 pH, with a resolution of 0.01 pH, using an interchangeable combination electrode, so that old electrodes can simply be removed and replaced. Temperature range is -39.9 to 149.9 ?C, with a resolution of 0.1 ?C, using a stainless-steel thermistor temperature probe. The unit features low battery indication and a user selectable backlight. An integrated rubber seal ensures complete water resistance.The pH readings are either manually or automatically temperature compensated over the operating range of 0 to 80?C. To automatically compensate, it is necessary to utilise the thermistor temperature probe. At the touch of a button, the instrument will automatically re-calibrate itself when used in conjunction with pH buffer solutions, and the unit will power off automatically after ten minutes, maximising battery life.Supplied as a kit, which includes 8100 Plus pH meter, pH electrode, temperature probe, 4.01 and 7.00 pH buffer solutions and a carrying case. UK manufactured.?? pH range -2 to 16 pH x 0.01 pH? Temperature range -39.9 to 149.9?C x 0.1?C? Accuracy ?0.02 pH / ?0.4?C? Clear, backlit LCD display? Easy to use re-calibration feature? ABS antimicrobial case? Operating Temperature 0?C to 50?C? Water/dust resistance IP66/67 protection? Power 3 x AAA batteries? Battery life 2500 hours? Dimensions 32 x 71 x 141mm? 2-year guarantee (meter only)