Instruct: Classify a review into positive or negative sentiment.
Query: temerature inadequate

Bought this as a present for my girlfriend. The first time we used it I used a digital thermometer to check the accuracy of the unit. After setting it a 375 and waiting for the light to turn off, I checked to find that the temperature of the oil was only 338 and dropping. I let the unit turn back on again but it still never topped 338. It was precise but precisely wrong. I used it anyway, deep frying tempura oysters but they came out (after more than 3 minutes) pale and heavy with oil. Tried again with smelts but overcooked them before the batter would brown.Am I doing something wrong? Is there a peculiarity that I'm not picking up on? Is this only good for french fries? Is my heating unit faulty? Who knows? Either way, its unacceptable for such an expensive unit.