A: Shipping and handling is flat rate $6 USD for orders less than $50 and $10 for orders greater than that. For orders desinated to U.S. 48 states, shippments are usuallysent via UPS or FedEx whenever possible. For orders desinated to other U.S. states or international orders, shippments are sent via United States Postal Service Registered Airmail. We charge 8.25% sales tax only for California addresses.

A: We recommend the following name brand PDAs. All of them have Type II CompactFlash slot as well as WLAN 801.11b. The price is ranging from $200 to $500. You may want to search Froogle to find the current lowest price, or try Ebay for a used one.

• HP iPAQ 2790, the latest PDA from HP with Microsoft Windows Mobile (Pocket PC) 2005.
• Dell Axim X50 and X50v (replaced by X51 and X51v).
• Dell Axim X51 and X51v.
• HP iPAQ hx2400 & hx2410 (being replaced by 2415), iPAQ hx2415, iPAQ hx2750 & 2755.

Besides the above models, our devices and software are also fully tested on the following PDAs:

• HP iPAQ 5450/5455 with CF expansion jacket and PPC2003 upgrade.
• Dell Axim X5 with PPC2003.

Currently we don't support other types of PDAs such as those based on Linux, PalmOS or Symbian. However, if demand warrants, we will add support. So please send us email if you want your PDA type to be supported.

A: Sorry, we dropped support for PPC 2002 after PPC 2005 is out. In other words, we only support PPC 2003 and 2005. You can easily upgrade your PPC 2002 PDA to PPC 2003. For instance, all of the following PDA models can be upgraded to PPC2003: iPAQ 3600/3850/3870/3970/5400, Dell Axim X5 and Toshiba E750. You can find a upgrade kit on Ebay for only a few dollars.

A: We offer 30 day money back guarantee. The returned device must in good condition. Refund is for the purchase price only. Shipping and handling charge is not refundable.

We also offer 6 months of part and labor warrenty. The warranty is for replacement only: if the device fails to perform the function it is designed to, then we will replace the device with the same or better model free of charge.

A: Handheld Sampler^TM Basic is always free. Handheld Sampler^TM Advanced version requires the purchase of a license. The main difference is that the advanced version allows you to set up wireless transmission to transmit acquired data in realtime to a database through a web server. All other features, including digital signal processing capabilities (e.g., digital filter, spectrum analysis, correlation functions) will remain in the basic version. See our software page for details.

A: Our credit card transactions are handled by PayPal, a global leader in online payments. In fact, we don't even get to see your card number, let alone store it. So you can use your credit card confidently knowing that you are dealing with a well-known and reputable company.

You do not need to have a Paypal account to use your credit card on our web site.

A: DAD stands for Data Acquisition Device. It is also the 3-leter interface name used in our software in Windows, just like those all too familiar "COM" or "LPT" names.