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-rw-r--r--klippy/extras/spi_temperature.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/klippy/extras/spi_temperature.py b/klippy/extras/spi_temperature.py
index d6f0a2ba..c7ae77a8 100644
--- a/klippy/extras/spi_temperature.py
+++ b/klippy/extras/spi_temperature.py
@@ -268,7 +268,7 @@ MAX31865_FAULT_RTDINLOW = 0x08
MAX31865_FAULT_OVUV = 0x04
VAL_A = 0.00390830
-VAL_B = 0.0000005775
+VAL_B = -0.0000005775
VAL_C = -0.00000000000418301
VAL_ADC_MAX = 32768.0 # 2^15