JNorton . . . The G2K's operation is a "no brainer". Although the LED has 4 operational states (or 5 if it has low fuel warning too) . . . the only thing you have to be concerned with is whether or not the LED is flashing steadily. It it's not, you've got a problem. It's that simplistic. The type of glowing status will tell you the general area of the problem. For example, if it's solid glowing solidly, you know it's a power prob. If it's flashing erratically, you know it's the switch harness. If it appears dark, you know it's an Rx prob. . . if it flashes once per second instead of the normal 6 pulses per sec . . you know your fuel is down to the warning level you preset . . etc. , etc. One of the Giant Scale pilots we sponsor was only 7 when she first started flying with G2K's onboard. She's now 11. It's saved her 100" scale Cub several times from one problem or another and she's never had any "interpretation" difficulties despite her age. But, if someone doesn't like it . . they've got 4 months to send it back for a 100% refund. Frankly, we've bought back a total of 3 units from 2 R/Cer's out of over 80,000 units in use in the past 3 years. Interpreting the G2K indications has never been an issue with anyone. " Accurate to 4 decimal points" simply means that if it is calibrated to trip (glow solidly) at 4.7777 volts on a 4.8 volt system . . . that's where it will trip every single time. All in all . . . the Gem 2000 is an ultra-simple yet extremely reliable safety product. BTW, I have no quarrels with what other products cost. Their mfg's know what they're worth. As the old saying goes . . you get what you pay for and you pay for what you get (as a rule).

Good Luck & Happy Landings,