If a pH probe is drifting or not holding a calibration immediately after the calibration process is performed with freshly prepared, accurate standards, then there may be a few things wrong with it.
First, consider the age of the pH Sensor. How o...
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Yes, you can get LoggerPro to display heart rate while you are recording EKG data. If you set up a calculated column and use the default Beats Per Minute settings on the EKG channel, you should get decent heart rate data displayed in real time. If th...
Use 30ml borosilicate glass vials with teflon PTFE lined caps (source: Cynmar Corporation, Item #115-27974, 12pack @ $11.00.) The diameter of the vials is big enough to accommodate the probes, unlike the BOD bottles, and they form a very good watert...
The body of Plastic 2-Way Valve (PS-2WAY) is polycarbonate and the handle is high density polyethylene. This is true for the older 3-way valve (discontinued), as well.
The chemical resistance is good when using dilute acids, alkaline solutions, al...
The table in the DO booklet and lab manuals only go up to certain elevations. The Excel file below contains approximate atmospheric pressures at various elevations and the saturated DO values for those elevations.
http://www2.vernier.com/til/2108/...
There is 0.23 g of silver metal and 0.002 mg/L AgCl in our pH sensors. These are both under the federal limits of waste disposal (but please check your state and local regulations as well). Therefore, there is no hazardous chemical in the sensor limi...
In the older-style Colorimeter (rounded shape rather than square), the cuvette holder is a plastic insert that can be removed and replaced. The order code for the replacement cuvette holder is CUV-HOLD.
To remove the cuvette holder from your Colo...
LabQuest platforms include an internal speaker and the Audio Function Generator app. The speaker can be used to hear a waveform produced using the Audio Function Generator, but due to the small size of the speaker, harmonic distortion is significant...
This is possible in the graph screen.
1. Go to the graph tab on your LabQuest.
2. Tap the Y-axis label (Absorbance) and select to graph the % Transmittance column.
The digital meter on the right of the graphing window will report the live % Transmi...
To measure and display the amplitude of various frequencies of sound using a fast Fourier transform:
Connect a microphone to any analog channel on the LabQuest or choose Sensor Setup from the Sensor menu and check Internal Microphone and choose O...