diff --git a/99-usbtmc.rules b/99-usbtmc.rules
new file mode 100644
index 0000000..b3ba074
--- /dev/null
+++ b/99-usbtmc.rules
@@ -0,0 +1,8 @@
+# Rule for Keithley 2611B
+
+# take vendor and product id from lsusb
+SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="05e6", ATTRS{idProduct}=="2614", GROUP="usbtmc", MODE="0660" RUN+="/bin/touch /tmp/05e6-2611-connected"
+
+# Devices
+KERNEL=="usbtmc/*",       MODE="0660", GROUP="usbtmc"
+KERNEL=="usbtmc[0-9]*",   MODE="0660", GROUP="usbtmc"
diff --git a/m_teng/backends/keithley/keithley.py b/m_teng/backends/keithley/keithley.py
index 84e6831..bc846f8 100644
--- a/m_teng/backends/keithley/keithley.py
+++ b/m_teng/backends/keithley/keithley.py
@@ -30,6 +30,8 @@ def init(beep_success=True):
         if beep_success: keithley.write("beeper.beep(0.5, 1000)")
         return keithley
 
+def beep(instr, length=0.5, pitch=1000):
+    instr.write(f"beeper.beep({length}, {pitch})")
 
 def exit(instr):
     instr.close()
diff --git a/m_teng/backends/keithley/measure.py b/m_teng/backends/keithley/measure.py
index 37d0e22..41133ec 100644
--- a/m_teng/backends/keithley/measure.py
+++ b/m_teng/backends/keithley/measure.py
@@ -3,7 +3,7 @@ import numpy as np
 from matplotlib import pyplot as plt
 import pyvisa
 
-from m_teng.backends.keithley import reset
+from m_teng.backends.keithley.keithley import reset
 from m_teng.utility import testing as _testing
 
 def measure_count(instr, count=100, interval=0.05, update_func=None, update_interval=0.5, beep_done=True, verbose=True):
diff --git a/m_teng/keithley_scripts/smua_reset.lua b/m_teng/keithley_scripts/smua_reset.lua
index 2938651..66a46ac 100644
--- a/m_teng/keithley_scripts/smua_reset.lua
+++ b/m_teng/keithley_scripts/smua_reset.lua
@@ -2,6 +2,7 @@
 smua.reset()
 smua.measure.autorangev = smua.AUTORANGE_ON
 smua.measure.autorangei = smua.AUTORANGE_ON
+-- smua.measure.autozero = smua.AUTOZERO_AUTO
 smua.measure.autozero = smua.AUTOZERO_AUTO
 -- smua.measure.autozero = smua.AUTOZERO_ONCE
 -- set output to 0A DC
diff --git a/m_teng/m_teng_interactive.py b/m_teng/m_teng_interactive.py
index aa40b3d..ec58305 100644
--- a/m_teng/m_teng_interactive.py
+++ b/m_teng/m_teng_interactive.py
@@ -232,7 +232,7 @@ def repeat(measure_func: callable, count: int, repeat_delay=0):
             sleep(repeat_delay)
     except KeyboardInterrupt:
         pass
-    if settings["beep"]: _backend.beep()
+    if settings["beep"]: _backend.beep(dev)
 
 
 def get_dataframe():
diff --git a/readme.md b/readme.md
index e5755ec..da2fd7b 100644
--- a/readme.md
+++ b/readme.md
@@ -1,5 +1,5 @@
 # m-TENG
-Helper scripts and shell for measuring **T**ribo**e**lectric **N**ano**g**enerator-based sensor output with a Keithley 2611B SMU or an Arduino
+Helper scripts and shell for measuring **T**ribo**e**lectric **N**ano**g**enerator-based sensor output with a Keithley 2600B SMU or an Arduino
 
 ## Features
 
@@ -17,9 +17,10 @@ Helper scripts and shell for measuring **T**ribo**e**lectric **N**ano**g**enerat
 - Run lua script on Keithley SMU
 - Auto-filenames
 
+
 ## Available backends
 ### keithley
-    Use a Keithley 2611B Source-Measure-Unit via *pyvisa*. This backend allows measuring both voltage and current simultaneously.
+    Use a Keithley 2600B Source-Measure-Unit via *pyvisa*. This backend allows measuring both voltage and current simultaneously. *Tested with 2611B and 2614B*
 
 ### arduino
     Use a Bluetooth capable Arduino with [https://git.quintern.xyz/MatthiasQuintern/teng-arduino](this software on the arduino).
@@ -37,3 +38,10 @@ ipython -i k_teng_interactive.py -- -*X*
 Substitute *X* for `-k` for keithley backend, `-a` for arduino backend or `-t` for testing backend.
 
 In the shell, run `help()` to get a list of available commands
+
+
+## Installation
+### Keithley
+On linux:
+Install the udev rule in `/etc/udev/rules.d/` and run `sudo udevadm control --reload` to force the usbtmc driver to be used with the Keithley SMU.
+The `ATTRS{product_id} ` needs to match the id shown by `lsusb`.