While clever and inexpensive, the low speed and low accuracy of this device made it unusable. It was billed as "3-figure accuracy", but in fact it only got that

While clever and inexpensive, the low speed and low accuracy of this device made it unusable. It was billed as "3-figure accuracy", but in fact it only got that on some cases. A bright undergrad or grad student could quickly uncover useful problems that it flat out couldn't solve. In short, it was a toy. Anyone basing one's academic grade on this thing was a fool. You really did have to spend the money for an HP-35, or the later Texas Instruments SR-5x calculators that were less expensive.