Not long after it was released (12-18 months ?) the PDA was out of production and further development of software was not provided by Microsoft. I can always re-calibrate it but this is a PITA. Mine continues to be very unreliable as far as holding calibration between sessions. It has very limited input/output connections. The IE33 is just the opposite as far as physical size/construction versus functions. The second generation mic they sold has been found to exhibit very poor repsonse. The wall wart PSU is a PITA and has an amazingly wimpy cable. The case design (for the kit) is just plain lame. Connection to a PC via Terralink was "touch & go" for me, it often did not work. The impedance function is limited to passive loads and is also limited to 4900-ohms, which seldom comes into play but when it does. As long as anything is plugged into an input (on the bottom), you cannot sit it on anything. It provides no means to attach it (the ATB) to a rack or otherwise anchor it. Even if it was on top, the case represents a source for potential reflections that would effect acoustic measurements. But it also has some incredibly dumb and frustrating shortcomings: the measurement mic input is on the bottom. On the one hand the Terrasonde is built like a tank and has the real estate to feature a good assortment of inputs and outputs plus a larger display. I suspect that they fixed some things with the IE35. To clarify: I own the IE33, which was the first generation of PDA-based multitesters from Ivie. You are comparing two devices I have owned and each has its own strengths and weaknesses.
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