The Caliper

Vernier Microstirrer

When we introduced our new Drop Counter, we decided to include a Vernier Microstirrer to enhance stirring. Since then, we have had many requests to have this as a separate product. The Microstirrer takes the place of the stirring bar that is typically used with a laboratory magnetic stirrer. The new Vernier Microstirrer easily attaches to the end of a pH Sensor, Conductivity Probe, Dissolved Oxygen Probe or Ion-Selective Electrode. When the magnetic stirrer plate (required, but not included) is turned on, its magnetic field turns the paddle wheel of the Microstirrer, resulting in enhanced stirring near the electrode tip. The Microstirrer works with any magnetic stirrer.

• The Microstirrer improves stirring throughout the vessel, especially in the vicinity of the electrode.
• It is especially useful with a Dissolved Oxygen Probe, because this sensor requires constant movement of solution past its membrane.

Vernier Circuit Board

Make your circuits labs easy with the new Vernier Circuit Board. The board comes with a variety of resistors, capacitors, light bulbs, switches, and an LED. Use the on-board batteries or an external supply for power. It’s easy to quickly connect the components using the supplied clip lead wires. Your students can study series and parallel circuits with both resistors and bulbs, try out various RC combinations, and use the function generator of LabPro to study the current-voltage behavior of a light bulb. Extra terminals allow you to add your own components.

New Look and Features for the Vernier Colorimeter!

One of our most popular sensors for chemistry, biology, and water quality testing is the Vernier Colorimeter. Our new Colorimeter has the following new features:

• Automatic calibration. Calibration is now much easier than ever before! Simply start up your data collection program, place a blank cuvette (with distilled water in most cases) into the cuvette slot, close the lid, and press the CAL button on the front of the Colorimeter. Within 10 seconds, the Colorimeter automatically performs the 0 and 100 percent transmittance calibration, and you are ready to collect data.
• Additional wavelength value. Due to popular demand, we have added another wavelength value on the Colorimeter: 430 nm (in addition to previous values of 470 nm, 565 nm, and 635 nm).
• Improved performance. The Colorimeter has a wider useful range, 10-90 percent transmittance (0.05-1.0 absorbance).

Why pay for an expensive Spectrophotometer to do absorbance vs. concentration (Beer’s law) or absorbance vs. time experiments when you can do it for $110 with the Vernier Colorimeter? With the Colorimeter, you have the advantage of computer, calculator, or Palm OS software that allows you to plot data, interpolate Beer’s law plots, or do 1 st and 2 nd order rate law determinations.

ORDERING INFORMATION
Product	Order Code	Price
Colorimeter	COL-BTA	$110.00