diff --git a/application.c b/application.c
index d079696..fb122ca 100644
--- a/application.c
+++ b/application.c
@@ -337,12 +337,41 @@ static float bed_tophalf_temperature(void)
 
 	// convert to °C
 	// calibrated using a DS18B20 (accuracy = +- 0.5°C), with 12-bit precision
-	// 558 = 19.500 °C, 1624 = 50.625, 2850 = 82.250
-	// 616 = 21.8 C, 2926 = 83.625
+	// 558 = 19.500 °C, 616 = 21.8 °C, 1624 = 50.625 °C, 2850 = 82.250 °C, 2926 = 83.625 °C
 
-	return measurement * 0.0273778 + 4.22317;
+	return measurement * 0.0270798 + 4.38946;
 }
 
+/** read bed bottom half temperature
+ *  @return temperature in °C
+ */
+static float bed_bothalf_temperature(void)
+{
+	const uint16_t measurement = sensor_max1247_read(1); // read measured value from corresponding thermistor
+
+	// convert to °C
+	// calibrated using a DS18B20 (accuracy = +- 0.5°C), with 12-bit precision
+	// 549 = 19.312 °C, 12 = 63.3 °C
+
+	return measurement * 0.0270798 + 4.38946;
+}
+
+/** read bed tube temperature
+ *  @return temperature in °C
+ */
+/*
+static float bed_tube_temperature(void)
+{
+	const uint16_t measurement = sensor_max1247_read(3); // read measured value from corresponding thermistor
+
+	// convert to °C
+	// calibrated using a DS18B20 (accuracy = +- 0.5°C), with 12-bit precision
+	// 19.312 °C = 564
+
+	return measurement * 0.0270798 + 4.38946;
+}
+*/
+
 /** read heat sink temperature
  *  @return temperature in °C
  */
@@ -352,14 +381,11 @@ static float bed_heatsink_temperature(void)
 
 	// convert to °C
 	// calibrated using a DS18B20 (accuracy = +- 0.5°C), with 12-bit precision
-	//  
+	// 557 = 19.312 °C, 1624 = 50.625 °C
 
-	return measurement * 0.0273778 + 4.22317; // TODO this values are from the bed top half
+	return measurement * 0.0273778 + 4.22317;
 }
 
-// bottom 12 = 63.3 °C
-// heat sink 
-
 /** run PID control for bed temperature (using the top half) */
 static void bed_pid(void)
 {
@@ -403,10 +429,6 @@ static void bed_pid(void)
 	tec_power((uint16_t)power); // set power
 }
 
-// bottom 19.312 = 549
-// sink 19.312 = 557
-// tube 19.312 = 564
-
 /** display available commands
  *  @param[in] argument no argument required
  */
@@ -1020,10 +1042,11 @@ void main(void)
 			// read temperatures
 			const float lid_temp = lid_temperature();
 			const float heatsink_temp = bed_heatsink_temperature();
-			const float bed_temp = bed_tophalf_temperature();
+			const float top_temp = bed_tophalf_temperature();
+			const float bot_temp = bed_bothalf_temperature();
 			// read bed temperatures
-			printf("bed: top=%.2f, bottom=%u, sink=%u %.02f, tube=%u; 393-A=%u; 339-3=%u\n", bed_temp, sensor_max1247_read(1), sensor_max1247_read(2), heatsink_temp, sensor_max1247_read(3), gpio_get(GPIO_PORT(BED_PIN_393A), GPIO_PIN(BED_PIN_393A)) ? 1 : 0, gpio_get(GPIO_PORT(BED_PIN_3393), GPIO_PIN(BED_PIN_3393)) ? 1 : 0);
-			printf("lid: %.02f V\n", lid_temp);
+			printf("bed: top=%u %.2f, bottom=%u %.02f, sink=%u %.02f, tube=%u; 393-A=%u; 339-3=%u\n",sensor_max1247_read(0), top_temp, sensor_max1247_read(1), bot_temp, sensor_max1247_read(2), heatsink_temp, sensor_max1247_read(3), gpio_get(GPIO_PORT(BED_PIN_393A), GPIO_PIN(BED_PIN_393A)) ? 1 : 0, gpio_get(GPIO_PORT(BED_PIN_3393), GPIO_PIN(BED_PIN_3393)) ? 1 : 0);
+			printf("lid: %.04f °C\n", lid_temp);
 			if (ds18b20_present) {
 				const float temp = sensor_ds18b20_temperature(0); // get temperature
 				sensor_ds18b20_convert(0); // start next conversion (since it takes almost 1 s)
@@ -1032,9 +1055,9 @@ void main(void)
 			// time to check if everything is OK
 			if (!error && STATE_SAFE != state) { // only check if we are not in the safe state
 				// check lid temperature
-				if (lid_temp < 5.0) { // voltage is at the upper limit (3.3V), meaning it is directly connected to the 5V pull-up resistor, and the lid thermistor does not pull it to ground
+				if (lid_temp < 5.0) { // voltage is at the upper limit (3.3V), meaning it is directly connected to the 3.3V pull-up resistor, and the lid thermistor does not pull it to ground
 					error = "lid thermistor is probably not connected";
-				} else if (lid_temp > 100) {
+				} else if (lid_temp > 100.0) {
 					error = "lid is getting too warm";
 				}
 				// check fan