The Checker and Checker Plus pH testers have been designed with many advanced features while maintaining the look and feel of the original Checker. The Checker Plus now offers automatic calibration to one or two points, automatic buffer recognition, calibrated buffer tags, stability indicator, low battery indicator, and selectable automatic shut off. The Checker plus still maintains the iconic pentagon design with a probe that measures 103 mm in length and tapered to a 8 mm diameter making it ideal for test tubes and vials.

• Enhanced LCD that displays reading, stability indicator, low battery indicator and calibration tags.
• 637-200-16 supplied gel filled pH electrode tapers to an 8 mm diameter at the sensing end. This narrow electrode easily fits into test tubes, vials, and other containers with small opening.
• Calibrated automatically to one or two points. The calibration buffers are automatically recognized and after calibration the buffer values used are shown on the display as a tag.
• An hourglass indicator is displayed on the LCD until a stable reading is obtained. Once a reading stabilized the indicator disappears and a reading can be recorded.
• The meter can be set to automatically turn off after 8 minutes or 60 minutes to conserve battery life in the event that the meter is left on. The auto off feature can be disabled.
• Automatic shut off: 8 minutes, 60 minutes, or can be disabled
• Battery type/life: 1.5V CR2032 (1) / approximately 1000 hours of continuous use
• Environment: 0 to 50°C (32 to 122°F); RH max 95%
• Dimensions: 50 x 174 x 21 mm (2 x 6.8 x 0.9")
• Weight: 50 g (1.8 oz.)
• Includes 637-200-16 pH electrode, HI70004 pH 4.01 buffer solution sachets (2 x 20 mL), HI70007 pH 7.01 buffer solution sachets (2 x 20 mL), HI700601 electrode cleaning solution sachets (2 x 20 mL), instruction manual, instrument quality certificate and plastic carrying case.