Bluelab 2.77 EC Calibration Solution 250 mL | 27.7 CF Conductivity Standard

What 2.77 EC Calibration Solution Is Actually For

Conductivity probes drift far less than pH probes do. Bluelab ships its pens factory calibrated for that reason, and treats calibration as optional rather than routine. So most of the time this bottle is a check, not a calibration. Sit a clean probe in fresh standard and see whether the display lands on 2.77 EC. If it does, the probe is clean and the number you read in the tank is real. If it does not, the probe usually wants cleaning before it wants calibrating. On a Bluelab pen the same solution then runs the calibration routine. The check mark it leaves on screen clears itself after 30 days. That is a quiet way of telling you how long it has been. Bluelab makes these solutions for its own instruments, NIST certified and to a traceable standard.

Getting a Bluelab Conductivity Solution to Last

2.77 EC is 27.7 CF. On a pen set to parts per million that is roughly 1,385 on the 500 scale, or near 1,940 on the 700 scale. Pour a working sample into a cup and put the probe in that. Never dip a probe into the bottle, and never tip a used sample back in. One careless pour turns the whole bottle into a bad reference, and a bad reference is worse than no reference at all. That is the argument for 250 mL. It covers a season of weekly checks on a pen or a Truncheon. The bottle is small enough that the last of it is still in good condition. Keep it sealed, cool and out of direct sun.

Key Features

• NIST certified: Made by Bluelab for Bluelab instruments, to a traceable standard.
• 2.77 EC equals 27.7 CF: Roughly 1,385 ppm on the 500 scale, or near 1,940 ppm on the 700 scale.
• A check first, a calibration second: Conductivity probes drift little, so this is mostly a verification fluid.
• Pour off, never dip: A probe in the bottle contaminates the reference for every future check.
• Never tip a sample back: Used standard goes down the drain. It has already picked up whatever was on the probe.
• 30 day calibration mark: A Bluelab pen shows a check mark that clears itself once a month has passed.
• Fits the whole Bluelab range: Conductivity pens, the Truncheon, and Guardian monitors on the EC side.
• Clean before you calibrate: A reading that will not settle is usually a dirty probe, not a lost calibration.
• Sized for one meter: 250 mL suits a single pen. Move to 500 mL for several meters or a monitor.

Technical Specifications